CELNAV (PRELIM EXAM) Flashcards
The new moon cannot be seen because the moon:
Between the Earth and the sun
The point of nearest approach of the planet to the Sun.
Perihelion
At First Point of Aries:
sun reaches 0° declination from North to South
On or about June 21:
North of the Arctic Circle, the sun never sets
While observing the moon, it is less than half with cusps turn towards the sun, the moon is
therefore:
Crescent waxing
It is the point where the moon reaches it’s farthest distance from the earth,
apogee.
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:
Elongation
The celestial body is said to be in _ when the sun is between this celestial body and earth.
superior conjunction
While observing the moon it is less than half with cusps turn away from the sun, the moon is
therefore:
Crescent waning
When the moon reaches quadrature, about a week after full moon, the moon ls:
half illuminated, waning
Torrid zone is
the parallels of about 23° 27.0 north and south
An area between the tropics of Cancer and Capricorn.
Torrid zone
In low latitude, a first quarter moon will always rise at about:
1200 LMT
About 2 weeks before the earth reaches perihelion,
days are shorter and nights are longer in the Northern Hemisphere
The line separating the illuminated and dark portions.
Terminator
It is the period taken by the moon to go to all phases.
lunation
When the moon reaches quadrature, about a week before full moon, the moon is:
half illuminated, waxing
Opposition occurs when:
The earth is between a planet and the sun
At First Point of Capricorn:
the sun is vertically overhead at noon at all places in lat 23° 27 S
When planet Venus is at greatest elongation east, Venus will rise:
in the eastern sky preceding sunrise
The period from perihelion to perihelion.
365 days, 6 hrs, 13 mins, 53 secs.
Complement of the sun’s maximum southerly declination that marks the northern limit of the south
frigid zone is:
66° 33’ S
Two celestial bodies are said to be in .
when their longitudes differ by 180°.
opposition.
Which is correct regarding the sun’s declination?
the sun is near maximum declination north at First Point of Cancer.
At winter solstice:
the days are shorter and the nights are longer in the Southern Hemisphere.
About ten or eleven days before the earth reaches aphelion,
days are shorter and nights are longer in the Southern Hemisphere.
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:
greatest elongation east.
Elongation becomes zero at the
inferior conjunction
The new moon cannot be seen because the moon:
Between the Earth and the sun.
In low latitudes, the full moon will always rise at about:
sunset
Which condition exist at the summer solstice in the Northern Hemisphere?
The Southern Hemisphere is having winter
Planets whose orbits are lesser than that of earth.
inferior planets.
The earth is said to be in “aphelion” on approximately:
4th July
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:
The southern hemisphere to the northern hemisphere
Temperate zones are
regions between the frigid and torrid zones
Superior conjunction occurs when
the sun is between the earth and the planet
At summer solstice,
everywhere north of the Arctic circle, the sun is circumpolar
When the sun is at aphelion, which of the following is correct regarding the sun’s
declination?
the sun’s declination is 0° going from N to S
On or about June 21,
has long warm days and short nights in the northern hemisphere
Solar year consists of
365 days, 5 hours, 48 mins., 46 secs
The moon is rising while the sun is setting. What is the phase of the moon?
Full Moon
First point of Capricorn occurs
on or about December 22
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.
Tropic of Capricorn
When the GHA of the sun equals the GHA of the moon, it is called:
conjunction.
A circle on the earth’s surface that connects all points of equal latitude.
parallel of latitude.
The approximate position of the stars are based on sidereal time, which is based upon
the rotation of the earth relative to:
Vernal equinox
Half of the meridian from pole to pole passing through a given point.
upper branch
This is the position of the moon’s conjunction when the moon has the same celestial
longitude as the sun.
New Moon
The motion of the sun as seen by an observer on earth.
Apparent
On or about June 21,
the sun reaches its highest declination north
The line joining perihelion and aphelion.
line of apsides
