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What is the moment when the sun appears to be across the celestial equator called?
The sun appears to cross the celestial equator twice in the course of one year. The point in the sky where the sun appears to cross the celestial equator on its way south is called the Autumnal Equinox. The moment when it appears to be in that position is called the "Beginning of Fall" in the northern hemisphere. The point in the sky where the sun appears to cross the celestial equator on its way north is called the Vernal Equinox. The moment when it appears to be in that position is called the "Beginning of Spring" in the northern hemisphere.
This happens at the equinox, which is around March 21 and September 21. (The date varies a day or so either way, depending on the cycle of leap years.)
If you need to know exactly when this is, you can look that up on the US Naval Observatory's web site on the "Earth's Seasons" page (linked below).
What else can I help you with?
Which constellation is closest to the celestial equator?
The celestial equator passes through 15 major constellations, including 5 from the Zodiac:AquilaAquariusCanus MinorCetusEridanusHydraLeoMonocerosOrionOphiuchusPiscesSerpansSextansTaurusVirgo
What is the star latitude and star declination?
Celestial coordinates. -- The star's latitude on the celestial sphere is the same as the Earth latitude that it seems to follow on its way aroujnd the sky. On the celestial sphere, the latitude is called "declination", and is expressed in degrees. -- The star's longitude on the celestial sphere is its angle, measured westward, from the point in the sky called the Vernal Equinox ... the point where the sun appears to cross the celestial equator in March. On the celestial sphere, the star's longitude is called "Right Ascension", and it's expressed in hours. That certainly seems confusing, but an "hour of Right Ascension" just means 15 degrees of celestial longitude. So, as the sky turns, the point directly over your head moves through the stars by 1 hour of Right Ascension every hour.
What celestial line is created by Earth's revolution around the sun?
The celestial line created by Earth's revolution around the sun is called the ecliptic. This is the apparent path that the sun appears to follow across the sky over the course of a year.
What is the point on the celestial sphere located at o hours right ascensions and o degrees declination?
The point on the celestial sphere located at 0 hours right ascension and 0 degrees declination is known as the vernal equinox. It marks the point where the celestial equator intersects the ecliptic and is used as the reference point for defining celestial coordinates. It also marks the beginning of spring in the Northern Hemisphere.
What is the imaginary sphere on which all objects in the sky seem to be located?
The imaginary sphere is called the celestial sphere. It is used in astronomy to track the apparent movements of celestial objects as if they were projected onto the inside of a sphere surrounding the Earth.
Which constellation is closest to the celestial equator?
The celestial equator passes through 15 major constellations, including 5 from the Zodiac:AquilaAquariusCanus MinorCetusEridanusHydraLeoMonocerosOrionOphiuchusPiscesSerpansSextansTaurusVirgo
What is the slow rotation of the plane of the celestial equator called?
Precession.
What is the great circle on the sky midway between the celestial poles called?
It's the celestial equator.
What do we call the imaginary extension of earth's equator into space?
The imaginary extension of Earth's equator into space is called the celestial equator. It is an imaginary line in the sky above the Earth's equator, dividing the celestial sphere into northern and southern hemispheres.
What is the star latitude and star declination?
Celestial coordinates. -- The star's latitude on the celestial sphere is the same as the Earth latitude that it seems to follow on its way aroujnd the sky. On the celestial sphere, the latitude is called "declination", and is expressed in degrees. -- The star's longitude on the celestial sphere is its angle, measured westward, from the point in the sky called the Vernal Equinox ... the point where the sun appears to cross the celestial equator in March. On the celestial sphere, the star's longitude is called "Right Ascension", and it's expressed in hours. That certainly seems confusing, but an "hour of Right Ascension" just means 15 degrees of celestial longitude. So, as the sky turns, the point directly over your head moves through the stars by 1 hour of Right Ascension every hour.
The intersection points between the ecliptic and the celestial equator are called?
Those would be the "equinoxes".
What celestial line is created by Earth's revolution around the sun?
The celestial line created by Earth's revolution around the sun is called the ecliptic. This is the apparent path that the sun appears to follow across the sky over the course of a year.
What is an imaginary line in the middle of the sky called?
The imaginary line in the middle of the sky is called the Celestial Equator. It is basically just like the equator that goes around the earth. It is basically the dividing line of two halves of the earth.
What is the point on the celestial sphere located at o hours right ascensions and o degrees declination?
The point on the celestial sphere located at 0 hours right ascension and 0 degrees declination is known as the vernal equinox. It marks the point where the celestial equator intersects the ecliptic and is used as the reference point for defining celestial coordinates. It also marks the beginning of spring in the Northern Hemisphere.
What is the imaginary line across the middle of the earth called?
The imaginary line across the middle of the Earth is called the equator. It divides the Earth into the Northern Hemisphere and Southern Hemisphere.
What is the imaginary sphere on which all objects in the sky seem to be located?
The imaginary sphere is called the celestial sphere. It is used in astronomy to track the apparent movements of celestial objects as if they were projected onto the inside of a sphere surrounding the Earth.
When does the sun pass from the southern celestial to the northern celestial hemisphere?
The point in the sky where the sun crosses the celestial equator on its way north is the point called the "Vernal Equinox". The sun reaches that point and passes it on March 21 every year.
