Astronomical Coordinate System

Equatorial Coordinate System

What is this

• a celestial (небесный coordinate system widely used to specify the positions of celestial objects
• the most common one
• the Earth based coordinate system

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celestial equator

• the projection of the Earth's equator onto the celestial sphere.

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Declination

• measures the angular distance of an object perpendicular to the celestial equator.
• positive to the north, negative to the south.
• origin for declination is the celestial equator

right ascension

• measures the angular distance of an object eastward along the celestial equator
• right ascension is usually measured in hours, minutes and seconds instead of degrees

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Let`s clarify this:
360 degree=24 hours
1 hour=60 min
1 min=60 sec
So:1 hours=15 degrees
1 min=0.25 degrees

thanks for ur attention