# How do you calculate right ascension and declination?

Right ascension and declination are co ordinates used in astronomy.

They are marked in celestial sphere.

Parallel to Earths equator celestial equator is marked..Declination is marked as zero at celestial equator and in degrees , minutes and seconds to south and north.\

Right Ascension is marked zero at first point of AriesVernal equinox) and is marked in hours, minutes and seconds.

First point of Aries is the intersection of Celestial equator and ecliptic.

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Right ascension and declination are calculated using celestial coordinate systems. Right ascension is measured in hours, minutes, and seconds eastward from the vernal equinox, while declination is measured in degrees north or south of the celestial equator. Right ascension can be calculated using the formula:

[ \text{Right Ascension (RA)} = \text{hour angle (HA)} + \text{sidereal time (ST)} ]

Declination can be calculated using the formula:

[ \text{Declination (Dec)} = \arcsin \left( \sin(\text{Latitude}) \times \sin(\text{Altitude}) + \cos(\text{Latitude}) \times \cos(\text{Altitude}) \times \cos(\text{Azimuth}) \right) ]

Where:

- HA is the hour angle of the object.
- ST is the sidereal time at the given observation location.
- Latitude is the observer's latitude.
- Altitude is the altitude of the object above the horizon.
- Azimuth is the azimuth of the object.

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When evaluating a one-sided limit, you need to be careful when a quantity is approaching zero since its sign is different depending on which way it is approaching zero from. Let us look at some examples.

When evaluating a one-sided limit, you need to be careful when a quantity is approaching zero since its sign is different depending on which way it is approaching zero from. Let us look at some examples.

When evaluating a one-sided limit, you need to be careful when a quantity is approaching zero since its sign is different depending on which way it is approaching zero from. Let us look at some examples.

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