Celnav Test 1 Study Set (Readings, Notes, Lectures)
Comprehensive Resource To Help You Ace 2026-2027 Exams Includes Frequently Tested Questions With
ELABORATED 100% Correct COMPLETE SOLUTIONS
Guaranteed Pass First Attempt!! Current Update!!
Used to measure distance. It is equal to the distance
Astronomical Units
between the Earth and Sun which is 92,960,000 miles
the distance light travels in one year Light Year
The relative brightness of celestial bodies is indicated by
magnitude
a scale
More precise limits of magnitude magnitude ratio
A spinning motion about an axis within a body rotation
motion of a body in its orbit around another body revolution
Point nearest the sun perihelion
point farthest from the sun aphelion
The line joining perihelion and aphelion line of apsides
when the moon is closest to the earth perigee
When the moon is farthest from the earth apogee
Observations of the Sun's Surface photo-sphere
The intersection of the mean plane of the Earth's orbit
Ecliptic
around the Sun with the celestial sphere
Planets with orbits closer to the Sun then the Earth Inferior Planets
Planets with orbits farther from the Sun then the Earth Superior Planets
Interval between oppositions is the Synodic Period
27.3 days is equal to a sidereal month
29.53 days is equal to synodic month
Occurs when the center of the sun crosses the equator
Vernal Equinox
going north
North pole of Earth's axis is titles toward the Sun Summer Solstice
Southern hemisphere is tilted toward the Sun Winter Solstice
, Celnav Test 1 Study Set (Readings, Notes, Lectures)
Comprehensive Resource To Help You Ace 2026-2027 Exams Includes Frequently Tested Questions With
ELABORATED 100% Correct COMPLETE SOLUTIONS
Guaranteed Pass First Attempt!! Current Update!!
0 degrees to 23.5 degrees North Tropic of Cancer
0 degrees to 23.5 degrees South Tropic of Capricorn
23 hours, 56 minutes, and 4 seconds sidereal day
Motion of the daily paths that appear as concentric circles diurnal cirlce/dirunal path
The projection of the Earth's equator onto the celestial
celestial equator
sphere
Apparent annual path of the sun eastward across the
ecliptic
celestial sphere, is a great circle
The point at which the Sun's vertical rays strike 23.5 N,
occurs June 21st or 22nd, the northern hemisphere is
summer solstice
tilted towards the sun, tropic of cancer, length of daylight
is greater then darkness
the point at which the Sun's vertical rays strike 23.5 S,
occurs December 21st or 22nd, the southern hemisphere
winter solstice
is titled toward the sun, tropic of Capricorn, less daylight
and longer nights
the sun is crossing the equator from north to south, equal
Autumnal Equinox
length of day and night, occurs September 22nd or 23rd,
the sun rays are crossing from south to north, equal length
Spring/Vernal Equinox
of day and night, occurs march 21st or 22nd
The result of gravitational forces exerted principally by
the Sun and Moon on the Earth equatorial bulge, takes Precession
25,800 years to complete
when the sun and moon paths intersect, takes 18.6 years
Node
to happen
The Northern most latitude in which the sun lights strikes Artic Circle
cylindrical projection parallel to the equator Mercator
, Celnav Test 1 Study Set (Readings, Notes, Lectures)
Comprehensive Resource To Help You Ace 2026-2027 Exams Includes Frequently Tested Questions With
ELABORATED 100% Correct COMPLETE SOLUTIONS
Guaranteed Pass First Attempt!! Current Update!!
A body that never sets circumpolar stars
States how much brighter a star is, can view up to the sixth
magnitude
level
One who's orbit is within the Earth's orbit Inferior Planet
One who's orbit is outside the Earth's orbit Superior Planet
When a body is between the Earth and the sun Inferior Conjunction
29.5 days Synodic days
length to go from perigee to apogee back to perigee 27.5 days
solar cycle 12 hours
lunar cycle 12 hours and 25 minutes
A sphere of infinite radius with the Earth at the center with
celestial object projected around it. Celestial bodies move Celestial Sphere
the Earth does not.
It's the intersection of the extended plane of the equator
Equinoctial
and the celestial sphere
An hour circle is a great circle through the celestial poles
and a point or body on the celestial sphere. Every celestial Hour Circles
body has a unique hour circle.
The arc of an hour circle between the celestial equator
and celestial body, measured North or South from the
declination
equinoctial through 90 degrees, and labeled N or S to
indicate the direction of measurement
A circle parallel to the celestial equator Parallel of declination
Path of the Sun ecliptic
The angular distance from a celestial pole, or the arc of an
hour circle between the celestial pole and a point on the polar distance
celestial sphere
Comprehensive Resource To Help You Ace 2026-2027 Exams Includes Frequently Tested Questions With
ELABORATED 100% Correct COMPLETE SOLUTIONS
Guaranteed Pass First Attempt!! Current Update!!
Used to measure distance. It is equal to the distance
Astronomical Units
between the Earth and Sun which is 92,960,000 miles
the distance light travels in one year Light Year
The relative brightness of celestial bodies is indicated by
magnitude
a scale
More precise limits of magnitude magnitude ratio
A spinning motion about an axis within a body rotation
motion of a body in its orbit around another body revolution
Point nearest the sun perihelion
point farthest from the sun aphelion
The line joining perihelion and aphelion line of apsides
when the moon is closest to the earth perigee
When the moon is farthest from the earth apogee
Observations of the Sun's Surface photo-sphere
The intersection of the mean plane of the Earth's orbit
Ecliptic
around the Sun with the celestial sphere
Planets with orbits closer to the Sun then the Earth Inferior Planets
Planets with orbits farther from the Sun then the Earth Superior Planets
Interval between oppositions is the Synodic Period
27.3 days is equal to a sidereal month
29.53 days is equal to synodic month
Occurs when the center of the sun crosses the equator
Vernal Equinox
going north
North pole of Earth's axis is titles toward the Sun Summer Solstice
Southern hemisphere is tilted toward the Sun Winter Solstice
, Celnav Test 1 Study Set (Readings, Notes, Lectures)
Comprehensive Resource To Help You Ace 2026-2027 Exams Includes Frequently Tested Questions With
ELABORATED 100% Correct COMPLETE SOLUTIONS
Guaranteed Pass First Attempt!! Current Update!!
0 degrees to 23.5 degrees North Tropic of Cancer
0 degrees to 23.5 degrees South Tropic of Capricorn
23 hours, 56 minutes, and 4 seconds sidereal day
Motion of the daily paths that appear as concentric circles diurnal cirlce/dirunal path
The projection of the Earth's equator onto the celestial
celestial equator
sphere
Apparent annual path of the sun eastward across the
ecliptic
celestial sphere, is a great circle
The point at which the Sun's vertical rays strike 23.5 N,
occurs June 21st or 22nd, the northern hemisphere is
summer solstice
tilted towards the sun, tropic of cancer, length of daylight
is greater then darkness
the point at which the Sun's vertical rays strike 23.5 S,
occurs December 21st or 22nd, the southern hemisphere
winter solstice
is titled toward the sun, tropic of Capricorn, less daylight
and longer nights
the sun is crossing the equator from north to south, equal
Autumnal Equinox
length of day and night, occurs September 22nd or 23rd,
the sun rays are crossing from south to north, equal length
Spring/Vernal Equinox
of day and night, occurs march 21st or 22nd
The result of gravitational forces exerted principally by
the Sun and Moon on the Earth equatorial bulge, takes Precession
25,800 years to complete
when the sun and moon paths intersect, takes 18.6 years
Node
to happen
The Northern most latitude in which the sun lights strikes Artic Circle
cylindrical projection parallel to the equator Mercator
, Celnav Test 1 Study Set (Readings, Notes, Lectures)
Comprehensive Resource To Help You Ace 2026-2027 Exams Includes Frequently Tested Questions With
ELABORATED 100% Correct COMPLETE SOLUTIONS
Guaranteed Pass First Attempt!! Current Update!!
A body that never sets circumpolar stars
States how much brighter a star is, can view up to the sixth
magnitude
level
One who's orbit is within the Earth's orbit Inferior Planet
One who's orbit is outside the Earth's orbit Superior Planet
When a body is between the Earth and the sun Inferior Conjunction
29.5 days Synodic days
length to go from perigee to apogee back to perigee 27.5 days
solar cycle 12 hours
lunar cycle 12 hours and 25 minutes
A sphere of infinite radius with the Earth at the center with
celestial object projected around it. Celestial bodies move Celestial Sphere
the Earth does not.
It's the intersection of the extended plane of the equator
Equinoctial
and the celestial sphere
An hour circle is a great circle through the celestial poles
and a point or body on the celestial sphere. Every celestial Hour Circles
body has a unique hour circle.
The arc of an hour circle between the celestial equator
and celestial body, measured North or South from the
declination
equinoctial through 90 degrees, and labeled N or S to
indicate the direction of measurement
A circle parallel to the celestial equator Parallel of declination
Path of the Sun ecliptic
The angular distance from a celestial pole, or the arc of an
hour circle between the celestial pole and a point on the polar distance
celestial sphere
