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Gen Nav Quick Theory Rev > Solar System > Flashcards

Solar System Flashcards

1
Q

Heavenly bodies located on a huge imaginary sphere called as

A

Celestial sphere

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2
Q

Sun’s declination?

A

23.5deg NORTH to 23.5deg SOUTH

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3
Q

Delhi and Mumbai latitude?

A

Delhi at 27deg north
Mumbai at 19-20deg north

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4
Q

The pt on celestial sphere directly above the observer

A

Zenith

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5
Q

Sun crosses Mumbai __ times a year (sun’s declination)

A

2

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6
Q

Sun crosses Delhi ___times a year (sun’s declination)

A

0

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7
Q

law which states each planet follows an elliptical path w the sun at one of the 2 focii points of the ellipse

A

kepler’s 1st law

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8
Q

law which states planets sweep equal areas in equal interval of time
A1=A2

A

kepler’s 2nd law of planetory motion

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9
Q

speed of planet will be FASTEST when

A

CLOSEST TO THE SUN

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10
Q

speed of planet will be SLOWEST when

A

FARTHEST FROM SUN

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11
Q

reason for season

A

inclination of the earth

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12
Q

reason for day and night haviing diff duration

A

inclination of the earth

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13
Q

Max declination range from
a)equator
b)poles

A

23.5deg
66.5deg

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14
Q

when are the Rate of change of day and night greatest

A

greatest in
SPRING AND AUTUMN EQUINOX

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15
Q

SUMMER SOLISTICE

A

JUNE 21

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16
Q

WINTER SOLISTICE

A

DECEMBER 22

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17
Q

PERIHELION (PAAS PAAS FROM SUN)

A

JAN 3

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18
Q

APEHELION( farthest from sun)

A

JULY 3

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19
Q

AUTUMN EQUINOX

A

SEPT 23

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20
Q

SPRING EQUINOX

A

MARCH 21

21
Q

Periods bw successive transits of star over a meridian

A

SIDERIAL DAY ( MEASURED FROM DISTANT STAR)

22
Q

SIDERIAL DAY DURATION

A

23HRS 56MIN approx

23
Q

SIDERIAL YEAR

A

time taken by earth to orbit around sun measured against a distant star

24
Q

SIDERIAL YEAR duration

A

365days 6hrs

25
Q

APPARENT SOLAR DAY will be a constant value TRUE OR FALSE

A

FALSE. IT IS NOT A CONSTANT VALUE

26
Q

APPARENT SOLAR DAY( MEASURED FROM REAL SUN) DURATION

A

VARIES FROM 23 HRS 44MIN TO 24HRS 14MIN

27
Q

MAX DIFF from 24hrs is
MAX diff of apparent day from mean solar day is

A

16 MINUTES (EQUATION OF TIME)

28
Q

EQUATION OF TIME HAPPENS IN THE MONTHS

A

NOVEMBER AND FEBRUARY

29
Q

Mean solar day ( hypothetical situation)

A

where it is asssumed that sun revolves around the earth at uniform speed in a circular orbit

30
Q

MEAN SOLAR DAY DURATION

A

24HRS

31
Q

APPARENT SOLAR DAY MAY BE ___ OR ___ THAN MEAN SOLAR DAY

A

LONGER OR SHORTER

32
Q

TROPICAL YEAR OR APPARENT SOLAR YEAR DURATION

A

365days 5hrs 48.75min

33
Q

Calender year duration

A

365 days

34
Q

every ___th year is a leap year

A

400th

35
Q

period before sunrise and after sunset when light is seen or remains is called

A

Twilight

36
Q

A)civil twilight ranges
B)nautical twilight
C)astronomical twilight

A

A)b/w sunset and when the centre of sun is 6 deg below sensible horizon

B)sun bw 6deg to 12deg below horizon
C)sun bw 12 deg to 18 deg below horizon

37
Q

inc in altitude, twilight__

A

decreases. since early sunrise and late sunset

38
Q

inc in latitude, twilight ___

A

increases.

39
Q

plane of earth’s orbit around sun

A

plane of ECLIPTIC

40
Q

plane of the equator

A

plane of EQUINOCTICAL

41
Q

duration of day and night is determined by

A

DECLINATION

42
Q

SUN CROSSES EQUATOR ___ A YEAR

A

TWICE

43
Q

SUN’S DECLINATION CHANGES ANNUALLY BW

A

23.5deg NORTH( SUN OVERHEAD TROPIC OF CANCER)
to
23.5deg SOUTH (SUN OVERHEAD
TROPIC OF CAPRICON)

44
Q

THE PLANE OF ECLIPTIC AND THE PLANE OF EQUINOCTICAL ARE INCLINED TO EACH OTHER AT AN ANGLE

A

23.5 DEG

45
Q

Plane of ecliptic and plane of equinoctial are inclined to each other at an angle of ?

A

23.5 deg

46
Q

At what times of the year does length of hrs of daylight change most rapidly

A

Spring and autumn equinox

47
Q

Which is the highest latitude at which the sun will rise above the horizon and set every day

A

66deg N/S

48
Q

Highest latitude at which sun will reach and angle of 90deg above the horizon at some time during the year

A

Gen Nav Quick Theory Rev (5 decks)

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