CELNAV (PRELIM EXAM)

Question 1

The new moon cannot be seen because the moon:

Answer 1

Between the Earth and the sun

Question 2

The point of nearest approach of the planet to the Sun.

Answer 2

Perihelion

Question 3

At First Point of Aries:

Answer 3

sun reaches 0° declination from North to South

Question 4

On or about June 21:

Answer 4

North of the Arctic Circle, the sun never sets

Question 5

While observing the moon, it is less than half with cusps turn towards the sun, the moon is
therefore:

Answer 5

Crescent waxing

Question 6

It is the point where the moon reaches it’s farthest distance from the earth,

Answer 6

apogee.

Question 7

As observed from the earth, the angle between the lines from the earth to the sun and the earth to a celestial body is known as:

Answer 7

Elongation

Question 8

The celestial body is said to be in _ when the sun is between this celestial body and earth.

Answer 8

superior conjunction

Question 9

While observing the moon it is less than half with cusps turn away from the sun, the moon is
therefore:

Answer 9

Crescent waning

Question 10

When the moon reaches quadrature, about a week after full moon, the moon ls:

Answer 10

half illuminated, waning

Question 11

Torrid zone is

Answer 11

the parallels of about 23° 27.0 north and south

Question 12

An area between the tropics of Cancer and Capricorn.

Answer 12

Torrid zone

Question 13

In low latitude, a first quarter moon will always rise at about:

Answer 13

1200 LMT

Question 14

About 2 weeks before the earth reaches perihelion,

Answer 14

days are shorter and nights are longer in the Northern Hemisphere

Question 15

The line separating the illuminated and dark portions.

Answer 15

Terminator

Question 16

It is the period taken by the moon to go to all phases.

Answer 16

lunation

Question 17

When the moon reaches quadrature, about a week before full moon, the moon is:

Answer 17

half illuminated, waxing

Question 18

Opposition occurs when:

Answer 18

The earth is between a planet and the sun

Question 19

At First Point of Capricorn:

Answer 19

the sun is vertically overhead at noon at all places in lat 23° 27 S

Question 20

When planet Venus is at greatest elongation east, Venus will rise:

Answer 20

in the eastern sky preceding sunrise

Question 21

The period from perihelion to perihelion.

Answer 21

365 days, 6 hrs, 13 mins, 53 secs.

Question 22

Complement of the sun’s maximum southerly declination that marks the northern limit of the south
frigid zone is:

Answer 22

66° 33’ S

Question 23

Two celestial bodies are said to be in .
when their longitudes differ by 180°.

Answer 23

opposition.

Question 24

Which is correct regarding the sun’s declination?

Answer 24

the sun is near maximum declination north at First Point of Cancer.

Question 25

At winter solstice:

Answer 25

the days are shorter and the nights are longer in the Southern Hemisphere.

Question 26

About ten or eleven days before the earth reaches aphelion,

Answer 26

days are shorter and nights are longer in the Southern Hemisphere.

Question 27

The point where a straight line from the earth is tangent to planet Venus orbit, when
the elongation becomes maximum and observes planet Venus brightest in the
eastern sky:

Answer 27

greatest elongation east.

Question 28

Elongation becomes zero at the

Answer 28

inferior conjunction

Question 29

The new moon cannot be seen because the moon:

Answer 29

Between the Earth and the sun.

Question 30

In low latitudes, the full moon will always rise at about:

Answer 30

sunset

Question 31

Which condition exist at the summer solstice in the Northern Hemisphere?

Answer 31

The Southern Hemisphere is having winter

Question 32

Planets whose orbits are lesser than that of earth.

Answer 32

inferior planets.

Question 33

The earth is said to be in “aphelion” on approximately:

Answer 33

4th July

Question 34

When the sun is said to be at the Vernal Equinox, it means that the sun is directly above the
equator. The sun is crossing the equator from:

Answer 34

The southern hemisphere to the northern hemisphere

Question 35

Temperate zones are

Answer 35

regions between the frigid and torrid zones

Question 36

Superior conjunction occurs when

Answer 36

the sun is between the earth and the planet

Question 37

At summer solstice,

Answer 37

everywhere north of the Arctic circle, the sun is circumpolar

Question 38

When the sun is at aphelion, which of the following is correct regarding the sun’s
declination?

Answer 38

the sun’s declination is 0° going from N to S

Question 39

On or about June 21,

Answer 39

has long warm days and short nights in the northern hemisphere

Question 40

Solar year consists of

Answer 40

365 days, 5 hours, 48 mins., 46 secs

Question 41

The moon is rising while the sun is setting. What is the phase of the moon?

Answer 41

Full Moon

Question 42

First point of Capricorn occurs

Answer 42

on or about December 22

Question 43

It is the declination of the sun 23.5° South and the vertical rays of the sun at the time of
winter solstice, this is about December 21.

Answer 43

Tropic of Capricorn

Question 44

When the GHA of the sun equals the GHA of the moon, it is called:

Answer 44

conjunction.

Question 45

A circle on the earth’s surface that connects all points of equal latitude.

Answer 45

parallel of latitude.

Question 46

The approximate position of the stars are based on sidereal time, which is based upon
the rotation of the earth relative to:

Answer 46

Vernal equinox

Question 47

Half of the meridian from pole to pole passing through a given point.

Answer 47

upper branch

Question 48

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

Answer 48

New Moon

Question 49

The motion of the sun as seen by an observer on earth.

Answer 49

Apparent

Question 50

On or about June 21,

Answer 50

the sun reaches its highest declination north

Question 51

The line joining perihelion and aphelion.

Answer 51

line of apsides