Question 187-1 : The length of the apparent solar day varies continuously throughout a year this is caused by ? [ Question security ]

Question 187-2 : Which definition of the equator is correct ?

The equator is a greatcircle with its plane perpendicular to the earth rotational axis.

Question 187-3 : The direction 'magnetic north' at a position on the earth is ?

The direction of the horizontal component of the earth's magnetic field at that position.

Question 187-4 : In which statement is the 'mean sun' best described ?

The mean sun is a fictitious sun coinciding each year with the apparent sun at the spring equinox and travelling along the celestial equator at uniform speed.

Easa definition mean sun the mean sun is conceived to move eastward along the celestial equator at a rate that provides a uniform measure of time equal to the average time reckoned from the true suncollins english dictionary mean sun an imaginary sun moving along the celestial equator at a constant rate and completing its annual course in the same time as the sun takes to move round the ecliptic at a varying rate it is used in the measurement of mean solar time

Question 187-5 : Which statement about the orbit of the earth is correct ?

The orbit of the earth around the sun is an ellipse with the sun at one of the foci.

Question 187-6 : The reason that the solar day lasts longer than the sidereal day is that ?

Both the direction of rotation of the earth around its axis and its orbital rotation around the sun are the same.

A solar day is the length of time between two successive passes of the sun across the same spot in the sky eg crossing the meridian overhead that time period is on average 24 00 00 hours or one mean solar daya sidereal day is the length of time between two successive passes of the fixed stars across the sky that time period is 23 56 04 or one sidereal daythe difference occurs because over the course of a year the earth does one revolution or 'lap' around the sun so that there must be one less solar day 36525 per year than there are sidereal days 36625 spread over the year comes to a difference of about four minutes each dayvdo930

Question 187-7 : Which definition describes best the notion 'poles' ?

The poles are the points of intersection between the earth's axis and the surface of the earth.

The north and south poles are at either end of the earth's axis around which the earth rotates

Question 187-8 : 'a' latitude is 00°ns'b' is located at 33°n 101°etrue track great circle from 'a' to 'b' at 'b' is 090°the initial true track of the great circle at 'a' is ?

057°.

2481it's a great circle at 'b' latitude is 33°n departure angle at the equator = 90° 'b' latitude = 057°

Question 187-9 : Given two positions a 56°s 010°w and b 56°s 030°w which statement is true ?

The departure between a and b is more than great circle distance between a and b.

Great circle is the shortest distance between two points 1462easa notice distance along a parallel of latitude is also known as departure

Question 187-10 : Standard time for same areas is listed in the air almanac as utc +13 instead of 11the reason for this is ?

Keeping the same date as the political and or economical entity to which they belong.

Question 187-11 : Polar circles are line of latitude at ?

67° ns.

Polar circles are two parallels of latitude each at a distance from a pole of the earth equal to about 23 degrees 27 minutes it forms the boundary between the north temperate and north frigid zones

Question 187-12 : Mu'a tonga islands is situated at 21°11's 175°07'w in the air almanac the standard time of tonga islands is listed as utc +13for august 21st the sunrise table in the air almanac shows 20°s 06 18 lmt30°s 06 28 lmtwhat is the standard time of sunrise at mu'a ?

06 59 on august 22nd.

Sunrise at 20°s = 06 18 lmt on 21 augustsunrise at 30°s = 06 28 lmt on 21 augustsunrise at 21°s will be 06 19 lmtconversion to utc 175°07' ==> 11h40 min 175 15°h 06h19 + 11h40 = 17h59 utcconversion to standard time 17h59 + 13 = 30h59 st30h59 24h = 06 59 on august 22nd

Question 187-13 : Position 'elephant point' is situated at 58°00'n 135°30'w standard time for this location is listed in the air almanac as utc 8hif sunset occurs at 00 57 utc on 21st january what is the time of sunset in lmt ?

15 55 on january 20th.

The conversion factor between lmt and utc is arc change of longitude converted to time 135°30' ==> 9h02 min 1355 15°h 00h57 9h02 = 15h55 lmt the day before january 20th

Question 187-14 : The direction of the earth's rotation on its axis is such that ?

Observed from the point above the north pole the rotation is counterclockwise.

The earth is described as rotating from west to east if you were looking down on the north pole from space the earth would be seen to be rotating anti clockwise this is why the sun appears to rise in the east and set in the west to an observer standing on the ground the earth then rotates around the sun in an anti clockwise direction on an elliptical path

Question 187-15 : The sun's declination is ?

The sun's position relative to the plane of equator.

Question 187-16 : The sun's declination is on a particular day 12°s midnight sun may this day be observed ?

South of 78°s.

Question 187-17 : The term 'sidereal' is used ?

To describe a situation or relationship concerning the stars.

Question 187-18 : The mean sun ?

Moves with constant speed along the celestial equator.

Question 187-19 : In its path around the sun the axis of the earth has an inclination ?

Of 66°33' with the plane of the path.

Juliarmengol98 2018 02 15 as far as i understand 0 to 23º27' 235º would be correct if the question asked for the latitudes the sun would be directly overhead at one point during its path as it asks for the earth's axis inclination 235º in relation to the plane of the earth like the equator 90º the relative angle inclination between them would be of 66º 33'~

Question 187-20 : As seen from an observer on the surface of the earth ?

The apparent sun is always in the plane of the ecliptic.

Apparent sun 'apparent solar time' or 'true solar time' is given by the daily apparent motion of the true or observed sun it is based on the apparent solar day which is the interval between two successive returns of the sun to the local meridianthe plane of the ecliptic is inclined to the plane of the equator at an angle of approximately 235° com encom061 712jpgfrom an observer on the surface of the earth the apparent sun is always in the plane of the ecliptic

Question 187-21 : The time it takes for the earth to complete one orbit around the sun is ?

365 days 5 hours 48 minutes and 45 seconds.

Question 187-22 : When the sun's declination is northerly ?

The daylight period is shorter in the southern hemisphere than the northern.

Question 187-23 : What is 'vertex' ?

The point on the great circle with greatest latitude.

1718a great circle which has an inclination of 33° to the equator reach a latitude of 33° nsthe point on the great circle with greatest latitude is called vertex every great circle has two vertices one in the northern hemisphere and the other in the southern hemisphereat the 'vertex' the great circle track is 090° or 270° and it is the closest point to the pole and the farther from the equator notice this question also exists with the following statement 'which statement about the vertex of a great circle is true in the vertex the great circle reaches its highest latitude'

Question 187-24 : Which statement about the vertex of a great circle is always true ?

In the vertex the true track is 090° or 270°.

1718a great circle which has an inclination of 33° to the equator reach a latitude of 33° nsthe point on the great circle with greatest latitude is called vertex every great circle has two vertices one in the northern hemisphere and the other in the southern hemisphereat the 'vertex' the great circle track is 090° or 270° and it is the closest point to the pole and the farther from the equator

Question 187-25 : A small circle ?

Has a plane that does not pass through the centre of the earth.

The centre of small circles does not coincide with the centre of the earth

Question 187-26 : Spring and autumn equinox are the moments at which the sun reaches ?

A declination of 0°.

Ecqb03 august 2016declination of the sun is the angular distance of the sun north or south of the celestial equator com encom061 682ajpgthe earth's equator is tilted 235 degrees with respect to the plane of the earth's orbit around the sun so at various times during the year as the earth orbits the sun declination varies from 235 degrees north to 235 degrees south com encom061 682bjpgthis gives rise to the seasons around december 21 the northern hemisphere of the earth is tilted 235 degrees away from the sun which is the winter solstice for the northern hemisphere and the summer solstice for the southern hemisphere around june 21 the southern hemisphere is tilted 235 degrees away from the sun which is the summer solstice for the northern hemisphere and winter solstice for the southern hemisphere on march 21 and september 21 are the spring and autumn equinoxes when the sun is passing directly over the equator a declination of 0° note that the tropics of cancer and capricorn mark the maximum declination of the sun in each hemisphere

Question 187-27 : An aircraft at latitude 02°20'n tracks 360° t for 685 km on completion of the flight the latitude will be ?

08°29'n.

On a meridian 1° = 60 nmwe are heading north 685 km 1852 = 370 nm370 60 = 616°016° x 60 = 96 min02°20'n + 6°09' = 08°29'n

Question 187-28 : Given a 50°n 070°w and b 50°n 080°w and the position of one of the vertices of the great circle between a and b as being equal to 50°064'n 075°000'w what is the position of the other vertex of this great circle ?

50°064s 105°000'e .

1718a great circle which has an inclination of 33° to the equator reach a latitude of 33° nsthe point on the great circle with greatest latitude is called vertex every great circle has two vertices one in the northern hemisphere and the other in the southern hemispherefor this question latitude is 50°064n therefore the antipode is 50°064sconcerning the longitude we are at + or 180° so 075°w + or 180° = 105°e

Question 187-29 : Sunrise in dublin 53°29'n 006°15'w is 06 23 lmt calculate the sunrise at bremen airport 53°09'n008°45'e in lmt ?

06 23.

Difference in longitude 006°15'+008°45' = 15°the earth moves around the sun at a rate of 4 minutes per degree of longitude 15°h latitude remains the same only the longitude changes the sun rises at bremen airport 1h before dublin but the sun rises at the same local mean time

Question 187-30 : Calculate the difference in lmt between dublin 53°29'n 006°15'w and bremen airport 53°09'n 008°45'e ?

01h 00m.

Question 187-31 : Calculate the approximate distance from waypoint dbu 53°290'n 000°286'w to a waypoint 20 nm north of bremen airport the coordinates of bremen airport are 53°090'n 008°450'e ?

3294 nm.

Latitude difference 53°290'n 53°090'n = 20' 20'x1°60'=033° if 033°x60nm1°=20nm it could be our waypointlongitude difference 008°450'e + 000°286'w = 922°distance = change longitude x 60nm x lat wpt = 922° x 60nm x cos5348° = 3292 nm andresmarina it is said 20 nm of north of bremen airportas you know 1 degree = 60 mins and 1 degree = 60 nm so 1 min = 1 nmbecause of that the waypoint is located at the same latitude than dbu waypoint in this case we should use the rhumb line formulad = change in long * 60* cos lm d = 92266 * 60 * cos 535 = 3292939 nm

Question 187-32 : Calculate the approximate distance from dublin 53°290'n 006°153'w to a waypoint 20 nm north of bremen airport the coordinates of bremen airport are 53°090'n 008°450'e ?

5357 nm.

Dublin > bremen = 15°1°=60nm on the equator1°=60nm x cos mean latitude 1°=60nm x cos 5333° 1°=35844nm15° x 35844 = 53766 nmthe closest answer 5357 nm

Question 187-33 : Route a 53°24'n 015°54'e to b 32°00'n 052°51'w distance flight plan is 3150 nm average gs is 450 ktdifference between standard time a and utc is 1 hour difference between standard time b and utc is 4 hoursestimated time of arrival eta b is 10 00 st b on 5 augustcalculate the estimated time of ?

08 00 st a 0508.

Flight time 3150x60 450=7heta b 10 00 st 5 aug change to utc utc+4 =10+4=14 00 utc 5 aug departure time 14 00 7h flight time =07 00 st 5 aug etd a 07 00 st 5 aug change to utc utc+1 =08 00 utc 5 aug

Question 187-34 : In producing chart projections the following projection surfaces may be used ?

Plane cylinder cone.

Question 187-35 : The term oblique in relation to map projections means that ?

The axis of the cylinder or cone is neither parallel to or perpendicular to the earth's axis of rotation.

Question 187-36 : A day at a place as measured in local mean time starts ?

When the mean sun transits the anti meridian of the place in question.

Ecqb03 december 2016

Question 187-37 : Standard time is ?

The time enforced by the legal authority to be used in a country or an area.

Question 187-38 : Daylight saving time summer time is 1 used to extend the sunlight period in the evening2 introduced by setting the standard time forward by one hour3 used in some countries ?

1 2 3.

Question 187-39 : The countries having a standard time slow on utc ?

Will generally be located at western longitudes.

Question 187-40 : The international date line is located ?

At the 180° ew meridian or in the vicinity of this meridian.