CELNAV (PRELIM)

Question 1

major planets only _ are normally used in
navigation

Answer 1

Venus, Mars, Jupiter and Saturn

Question 2

apparent positions of the planets in relation to other members of the Solar System

Answer 2

PLANETARY CONFIGURATION

Question 3

whose orbits lie inside that of the earth like Mercury and Venus.

Answer 3

Inferior planets-

Question 4

whose orbits lie outside that of the earth like Mars, Jupiter, Saturn, Uranus,
Neptune (and Pluto)

Answer 4

Superior planets-

Question 5

Inner planets-

Answer 5

Mercury, Venus, Earth and Mars

Question 6

Outer planets-

Answer 6

Jupiter, Saturn, Uranus, Neptune (and Pluto)

Question 7

Mean distances of the planets from the sun ranges from_

Answer 7

67 million miles for Venus, 886 million miles for
Saturn, the period required by each complete a revolution around the sun carry from about 225 days for
Venus, to 29 ½ years for SaturnConjunction (of a body)- is the position on its orbit when it has the same celestial longitude as the sun.

Question 8

is the position on its orbit when it has the same celestial longitude as the
sun.

Answer 8

Conjunction (of a body)-

Question 9

if the planet is between the earth and the sun

Answer 9

Inferior conjunction-

Question 10

if planet is on the opposite side of the sun to the earth

Answer 10

Superior conjunction-

Question 11

is the difference between the longitude of the sun and that of the body or
the angle between the lines from the earth to the sun, from the earth to the celestial body

Answer 11

Elongation (of a body)-

Question 12

the sun, moon and earth are in line and the sun and moon are on the opposite. Occurs
at Full Moon

Answer 12

Opposition-

Question 13

the sun and moon are 900 in relation to the earth. Occurs at First Quarter and Last
Quarter

Answer 13

Quadrature-

Question 14

Elongation:
New Moon=
First/Last quarter=
Full Moon=

Answer 14

New Moon= 0 degrees
First/Last quarter= 90 degrees
Full Moon= 180 degrees

Question 15

is the position of the moon’s conjunction when the moon has the same celestial longitude
as the sun.

Answer 15

New Moon-

Question 16

Age of the moon is 0 day

Answer 16

New Moon-

Question 17

the moon’s elongation has increased and parts of the moon’s illuminated disc is visible
from the earth.

Answer 17

Waxing crescent-

Question 18

It appears as a crescent with cusps or horns turned towards the sun.

Answer 18

Waxing crescent-

Question 19

the moon reaches quadrature. The half of the moon toward the sun is illuminated.

Answer 19

First Quarter

Question 20

Age of
the moon is 7 ¼ days.

Answer 20

First Quarter

Question 21

more than half of the illuminated moon is visible from the earth

Answer 21

Gibbous-

Question 22

the moon is in opposition. The whole of the illuminated half of the moon is facing the earth
and the moon appears as full.

Answer 22

Full moon-

Question 23

Age of the moon is 14 ½ days.

Answer 23

Full moon-

Question 24

After full moon, the visible moon decreases in size, the moon again becomes

Answer 24

Gibbous-

Question 25

the moon is again in quadrature. The half of the moon toward the sun is illuminated.

Answer 25

Last Quarter-

Question 26

Age
of the moon is about 21 ¾ days

Answer 26

Last Quarter-

Question 27

the sunlit areas appear on the eastern side of the moon

Answer 27

Waning Crescent-

Question 28

the time when the size of the visible moon is increasing

Answer 28

Moon waxing-

Question 29

the time when the size of visible moon is decreasing

Answer 29

Moon waning-

Question 30

from new moon to the next new moon.

Answer 30

Lunation-

Question 31

the full moon occuring nearest the autumnal equinox.

Answer 31

Harvest moon-

Question 32

the full moon next following the harvest moon.

Answer 32

Hunter’s moon-

Question 33

the line separating the illuminated and dark portions

Answer 33

Terminator-

Question 34

The motion of the bodies of
the solar system relative to surrounding stars is called

Answer 34

space motion

Question 35

The earth itself is one of these moving
bodies, the motion of other bodies as seen by an observer on the earth is called

Answer 35

apparent motion

Question 36

If the earth were stationary in space, any change in the position of another body, relative to the earth,
would be due only to the motion of that body, this motion is called

Answer 36

absolute motion