An observer is situated on the parallel of 23 5°S Which statement about the passage of the apparent sun in relation to this position is correct ?
MCQ > aircraft
At 54°N 020°W the sun rises on November 28th at 09 01 UTC At 44°N 020°W the sun will rise ?
What is the correct definition of latitude of a position on the earth ?
When proceeding on a given date along a parallel towards east moment of sunrise will occur one hour earlier every 15° difference in longitude when it expressed in Latitude the angle between plane of equator the line from centre of earth to position. on november 28th we are approaching winter solstice (21 22 december) the axis of earth tilted 23 5° degrees from 'vertica this causes northern hemisphere to be tilted toward sun during half year tilted away from sun other half of year after autumnal equinox northern hemisphere tilted away and as you can see on this picture position '44°n 020°w' will see sun rising earlier than position '54°n 020°w'. 
The maximum difference in distance when proceeding along great circle between two positions in stead of rhumb line will occur On east west tracks at high latitudes. Img /com_en/com061 674 jpg green great circle track red rhumb line right answer east west track at high latitudes but west east track at high latitudes will also be right. 
Geodetic latitude and geocentric latitude coincide On east west tracks at high latitudes. geocentric latitude measured from centre of ellipsoid geodetic or geographic latitude ? which what normally measured the angle between plane of equator the line which normal to ellipsoid at point of interest unlike geocentric latitude this line does not typically pass through centre of ellipsoid whenever unqualified term latitude used it will normally mean geographic latitude the relation between geodetic latitude the geocentric latitude is the geodetic geocentric latitudes are equal at equator poles the value of squared eccentricity approximately 0 007 (depending on choice of ellipsoid) the maximum difference between geocentric geodetic latitude approximately 11 5 minutes of arc at a geodetic latitude of 45°6'. 
The time difference in local mean time between sunset at positions a 50°n 120°e and b 50°s 120°e on 21st of november Some hours the sun rises earlier in b than in a. on 21st of november it's winter in northern hemisphere timing of sunsets sunrises are driven the axial tilt of earth in summertime days get longer sunsets occur later thus since it summer in southern hemisphere sun will rise earlier in b than a the sun will disappear earlier in a than in b. Question 157-8
Which statement about standard time true Standard time determined the government of appropriate state does not necessarily follow borders of 5° wide longitude zones. the local time at 125°w utc 8h20m the standard time determined the government of appropriate state does not necessarily follow borders of 15° wide longitude zones. Question 157-9
Which statement correct about apparent solar day The apparent solar day the period between two successive transits of true sun through same meridian. the solar day or time corresponding to one rotation of earth with respect to direction of sun the most natural unit of time ordinary purposes if time was regulated stars sidereal noon would occur at night during half year for obvious reasons this would not be a satisfactory condition also to begin solar day when sun crosses observer's meridian would result in confusion so to keep an orderly scheme of things we start solar day when sun crosses lower meridian of observer the instant of time when sun on lower branch of observer's meridian defined as solar midnight when sun crosses upper branch of observer's meridian it solar noon at observer's location the period between two successive transits of true sun through same meridian called an apparent solar day the time indicated the position of actual (true) sun called apparent solar time the mean solar day an invariable unit of time it based on a fictitious or mean sun which imagined to move at a uniform rate in its apparent path about earth. Question 157-10
Which statement regarding apparent s and mean s is correct The apparent sun the visible sun mean sun a fictitious sun. apparent sun ('apparent solar time' or 'true solar time') given the daily apparent motion of true or observed sun it based on apparent solar day which the interval between two successive returns of sun to local meridian the mean sun imaginary sun moving along celestial equator at a constant rate completing its annual course in same time as sun takes to move round ecliptic at a varying rate it used in measurement of mean solar time mean solar time conceptually the hour angle of fictitious mean sun the duration of daylight varies during year length of a mean solar day nearly constant unlike that of an apparent solar day. Question 157-11
The declination of s is defined as The angular distance of sun north or south of celestial equator. img /com_en/com061 682 gif directly above equator of earth we find celestial equator in sky declination of sun the angular distance of sun north or south of celestial equator img /com_en/com061 682a jpg the earth's equator tilted 23 5 degrees with respect to plane of earth's orbit around sun so at various times during year as earth orbits sun declination varies from 23 5 degrees north to 23 5 degrees south img /com_en/com061 682b jpg this gives rise to seasons around december 21 northern hemisphere of earth tilted 23 5 degrees away from sun which the winter solstice the northern hemisphere the summer solstice the southern hemisphere around june 21 southern hemisphere tilted 23 5 degrees away from sun which the summer solstice the northern hemisphere winter solstice the southern hemisphere on march 21 september 21 are fall spring equinoxes when sun passing directly over equator note that tropics of cancer capricorn mark maximum declination of sun in each hemisphere. Question 157-12
The time interval between sunrise and sunset dependent on The declination of sun the latitude of observer. depending on your location times of sunrise sunset the length of daylight period varies in a sine wave pattern the axis of spin of earth not vertical to plane between earth the sun even though earth spins on that axis rotates around sun tilt of axis never changes because of this northern southern hemispheres are exposed to more or less sunlight at different times as a result when top of earth in a position where it closer to sun sun's light rays strike well above equator resulting in summer longer days img /com_en/com061 684 gif when it summer in northern hemisphere it winter in southern hemisphere. Question 157-13
The definition of true north any observer The direction of observer's meridian to north pole. true north may in practical terms be magnetic north corrected local variation but that not definition the definition 'the direction from observer to geographic north pole along local meridian'. Question 157-14
A definition of a magnetic track angle The direction of a line referenced to magnetic north. magnetic track angle the angle (measured in a clockwise direction) between track magnetic north the direction of longitudinal axis of an aircraft referenced to magnetic north the magnetic heading of aircraft the direction of longitudinal axis of an aircraft referenced to compass north the compass heading of aircraft. Question 157-15
The main reason the occurrence of seasons on earth The inclination of earth axis with regard to plane of ecliptic. the axis of earth currently tilted 23 5° degrees from 'vertica this causes northern hemisphere to be tilted toward sun during half year tilted away from sun other half of year this the mechanism responsible the seasons the ecliptic the apparent path of sun around earth. Question 157-16
The length of apparent solar day varies continuously throughout a year this caused The tilt of earth's axis the elliptical orbit of earth around sun. the axis of earth currently tilted 23 5° degrees from 'vertica this causes northern hemisphere to be tilted toward sun during half year tilted away from sun other half of year this the mechanism responsible the seasons the ecliptic the apparent path of sun around earth. Question 157-17
Which definition of equator correct The equator a greatcircle with its plane perpendicular to earth rotational axis. the axis of earth currently tilted 23 5° degrees from 'vertica this causes northern hemisphere to be tilted toward sun during half year tilted away from sun other half of year this the mechanism responsible the seasons the ecliptic the apparent path of sun around earth. Question 157-18
The direction 'magnetic north' at a position on earth The direction of horizontal component of earth's magnetic field at that position. earth's magnetic field has various distortions may not be aligned with great circle to magnetic pole a freely suspended magnet will align itself with earth's magnetic field (assuming no other fields influencing magnet) the total field (force t) resolved into a horizontal component (force h) a vertical component (force z) we try to keep magnets in a direct reading compass as close as possible to local horizontal suspending them below pivot point and in some cases adding weights to bias them the northern hemisphere or southern hemisphere the alignment of horizontal component of earth's field is therefore azimuthal alignment of magnetic north. Question 157-19
In which statement the 'mean sun' best described The mean sun a fictitious sun coinciding each year with apparent sun at spring equinox travelling along celestial equator at uniform speed. easa definition mean sun the mean sun conceived to move eastward along celestial equator at a rate that provides a uniform measure of time equal to average time reckoned from true sun collins english dictionary mean sun an imaginary sun moving along celestial equator at a constant rate completing its annual course in same time as sun takes to move round ecliptic at a varying rate it used in measurement of mean solar time. Question 157-20
Which statement about orbit of earth correct The orbit of earth around sun an ellipse with sun at one of foci. easa definition mean sun the mean sun conceived to move eastward along celestial equator at a rate that provides a uniform measure of time equal to average time reckoned from true sun collins english dictionary mean sun an imaginary sun moving along celestial equator at a constant rate completing its annual course in same time as sun takes to move round ecliptic at a varying rate it used in measurement of mean solar time. Question 157-21
The reason that solar day lasts longer than sidereal day that Both direction of rotation of earth around its axis its orbital rotation around sun are same. A solar day the length of time between two successive passes of sun across same spot in sky (e g crossing meridian overhead) that time period is on average 24 00 00 hours or one mean solar day a sidereal day the length of time between two successive passes of fixed stars across sky that time period 23 56 04 or one sidereal day the difference occurs because over course of a year earth does one revolution or 'lap' around sun so that there must be one less solar day (365 25) per year than there are sidereal days (366 25) spread over year comes to a difference of about four minutes each day . Question 157-22
Which definition describes best notion 'pole The poles are points of intersection between earth's axis the surface of earth. the north south poles are at either end of earth's axis around which earth rotates. Question 157-23
'a' latitude 00°n/s 'b' located at 33°n 101°e true track great circle from 'a' to 'b' at 'b' 090° the initial true track of great circle at 'a' The poles are points of intersection between earth's axis the surface of earth. it's a great circle at 'b' latitude 33°n departure angle at equator = 90° ('b' latitude) = 057°. Question 157-24
Given two positions a 56°s 010°w and b 56°s 030°w which statement true The departure between a b more than great circle distance between a b. great circle the shortest distance between two points easa notice distance along a parallel of latitude also known as departure. Question 157-25
Standard time same areas listed in air almanac as utc +13 instead of 11 the reason this Keeping same date as political or economical entity to which they belong. great circle the shortest distance between two points easa notice distance along a parallel of latitude also known as departure. Question 157-26
Polar circles are line of latitude at Keeping same date as political or economical entity to which they belong. polar circles are two parallels of latitude each at a distance from a pole of earth equal to about 23 degrees 27 minutes it forms boundary between north temperate north frigid zones. Question 157-27
Mu'a tonga islands situated at 21°11's 175°07'w in air almanac standard time of tonga islands listed as utc +13 for august 21st sunrise table in air almanac shows 20°s 06 18 lmt30°s 06 28 lmtwhat the standard time of sunrise at mu'a 6 59 on august 22nd. sunrise at 20°s = 06 18 lmt on 21 august sunrise at 30°s = 06 28 lmt on 21 august sunrise at 21°s will be 06 19 lmt conversion to utc 175°07' ==> 11h40 min (175 / 15°/h) 06h19 + 11h40 = 17h59 utc conversion to standard time 17h59 + 13 = 30h59 st 30h59 24h = 06 59 on august 22nd. Question 157-28
Position 'elephant point' situated at 58°00'n 135°30'w standard time this location listed in air almanac as utc 8h if sunset occurs at 00 57 utc on 21st january what the time of sunset in lmt 5 55 on january 2 th. the conversion factor between lmt utc arc (change of longitude) converted to time 135°30' ==> 9h02 min (135 5 / 15°/h) 00h57 9h02 = 15h55 lmt day before (january 20th). Question 157-29
The direction of earth's rotation on its axis such that Observed from point above north pole rotation counterclockwise. the earth described as rotating from west to east if you were looking down on north pole from space earth would be seen to be rotating anti clockwise this why sun appears to rise in east set in west to an observer standing on ground the earth then rotates around sun in an anti clockwise direction on an elliptical path. Question 157-30
The sun's declination The sun's position relative to plane of equator. the earth described as rotating from west to east if you were looking down on north pole from space earth would be seen to be rotating anti clockwise this why sun appears to rise in east set in west to an observer standing on ground the earth then rotates around sun in an anti clockwise direction on an elliptical path. Question 157-31
The sun's declination on a particular day 12°s midnight s may this day be observed The sun's position relative to plane of equator. the earth described as rotating from west to east if you were looking down on north pole from space earth would be seen to be rotating anti clockwise this why sun appears to rise in east set in west to an observer standing on ground the earth then rotates around sun in an anti clockwise direction on an elliptical path. Question 157-32
The term 'siderea used To describe a situation or relationship concerning stars. the earth described as rotating from west to east if you were looking down on north pole from space earth would be seen to be rotating anti clockwise this why sun appears to rise in east set in west to an observer standing on ground the earth then rotates around sun in an anti clockwise direction on an elliptical path. Question 157-33
The mean s Moves with constant speed along celestial equator. the earth described as rotating from west to east if you were looking down on north pole from space earth would be seen to be rotating anti clockwise this why sun appears to rise in east set in west to an observer standing on ground the earth then rotates around sun in an anti clockwise direction on an elliptical path. Question 157-34
In its path around s the axis of earth has an inclination Of 66°33' with plane of path. Juliarmengol98 2018 02 15 as far as i understand 0 to 23º27'(23 5º) would be correct if question asked the latitudes sun would be directly overhead at one point during its path as it asks the earth's axis inclination (23 5º) in relation to plane of earth (like equator 90º) relative angle (inclination) between them would be of 66º 33'~. Question 157-35
As seen from an observer on surface of earth The apparent sun always in plane of ecliptic. apparent sun ('apparent solar time' or 'true solar time') given the daily apparent motion of true or observed sun it based on apparent solar day which the interval between two successive returns of sun to local meridian the plane of ecliptic inclined to plane of equator at an angle of approximately 23 5° img /com_en/com061 712 jpg from an observer on surface of earth apparent sun always in plane of ecliptic. Question 157-36
The time it takes the earth to complete one orbit around s is 365 days 5 hours 48 minutes 45 seconds. apparent sun ('apparent solar time' or 'true solar time') given the daily apparent motion of true or observed sun it based on apparent solar day which the interval between two successive returns of sun to local meridian the plane of ecliptic inclined to plane of equator at an angle of approximately 23 5° img /com_en/com061 712 jpg from an observer on surface of earth apparent sun always in plane of ecliptic. Question 157-37
When sun's declination northerly The daylight period shorter in southern hemisphere than northern. apparent sun ('apparent solar time' or 'true solar time') given the daily apparent motion of true or observed sun it based on apparent solar day which the interval between two successive returns of sun to local meridian the plane of ecliptic inclined to plane of equator at an angle of approximately 23 5° img /com_en/com061 712 jpg from an observer on surface of earth apparent sun always in plane of ecliptic. Question 157-38
What 'vertex' The point on great circle with greatest latitude. a great circle which has an inclination of 33° to equator reach a latitude of 33° n/s the point on great circle with greatest latitude called vertex every great circle has two vertices one in northern hemisphere the other in southern hemisphere at 'vertex' great circle track 090° or 270° it the closest point to pole the farther from equator notice this question also exists with following statement 'which statement about vertex of a great circle true? in vertex great circle reaches its highest latitude'. Question 157-39
Which statement about vertex of a great circle always true In vertex true track 9 ° or 27 °. a great circle which has an inclination of 33° to equator reach a latitude of 33° n/s the point on great circle with greatest latitude called vertex every great circle has two vertices one in northern hemisphere the other in southern hemisphere at 'vertex' great circle track 090° or 270° it the closest point to pole the farther from equator. Question 157-40
A small circle Has a plane that does not pass through centre of earth. the centre of small circles does not coincide with centre of earth.
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