<p>At noon on 1 Jan 2000 (UT) the sun's RA &amp; dec were (J2000):</p>

<p>18hrs 45min 9.36s</p>

<p>-23deg, 2 m, 8.2s</p>

<p>This is per Guide9 software.</p>

CC BY-SA 4.0
2020-04-10T11:39:13.997Z
This answer would be better if you use 11:58:55.816 UTC, see https://en.wikipedia.org/wiki/Epoch_(astronomy)#Julian_Dates_and_J2000
PM 2Ring
CC BY-SA 4.0
2020-04-10T12:03:50.970Z
Thanks, I wasn't aware of that.  To the nearest second, both RA and Dec, it makes no difference.
Dr Chuck
CC BY-SA 4.0
2020-04-10T12:15:06.950Z
No worries. I didn't expect it to make a significant difference. But since the OP wants the values right at the instant of the J2000 epoch, we might as well do it properly. ;)
PM 2Ring
CC BY-SA 4.0
2020-04-10T11:02:25.307Z
2020-04-10T11:02:25.307Z
Dr Chuck
<p>I'm in the somewhat awkward position of asking something that, despite me thinking there should be hundreds and hundreds of web pages and datasets showing this particular value, I've been unable to find anything about it.</p>

<p>What, indeed, are the Right Ascension and Declination angles of the Sun for J2000 ? Wikipedia shows some values (RA = 286.13, Dec = 63.87), but it is not clear whether they are J2000 or not...</p>

CC BY-SA 4.0
2020-04-09T22:32:05.163Z
What Wikipedia article gave those coordinates? The Sun's declination on Jan 1 should be more like -23°.
Mike G
CC BY-SA 4.0
2020-04-09T23:46:20.423Z
I think the coordinates you mention are the RA and Dec. of the direction of the North Pole of the Sun. If you're looking for the RA/Dec. of the position of the Sun in the sky, then they need to be computed based on the date and time, since they change throughout the year. You may be interested in this Wikipedia article : [Position of the Sun](https://en.wikipedia.org/wiki/Position_of_the_Sun). Also, several web services, software and programming libraries can compute them for you (Ex: Pyephem, Skyfield, Stellarium, JPL Horizons, etc.)
FSimardGIS
CC BY-SA 4.0
2020-04-10T03:14:18.430Z
@FSimardGIS I'm pretty sure that Izhido is asking for the RA & Dec of the Sun at the exact instant of the J2000 epoch, i.e., on the 1st of January 1, 2000, at 12:00 Terrestrial Time.
PM 2Ring
CC BY-SA 4.0
2020-04-10T03:31:41.673Z
@PM2Ring You're right, he says "at J2000", I guess I misread earlier. Then we need to compute RA/Dec. for January 1, 2000 12:00 TT.
FSimardGIS
CC BY-SA 4.0
2020-04-10T23:30:30.307Z
@MikeG, check https://en.wikipedia.org/wiki/Sun, in the table at the right side of the page, under "Rotation Characteristics"
Izhido
<the-sun><declination><astrometry><right-ascension>
RA and Dec of the Sun at J2000
Izhido
# RA and Dec of the Sun at J2000

(Asked by: username_0 on 2020-04-09)

I'm in the somewhat awkward position of asking something that, despite me thinking there should be hundreds and hundreds of web pages and datasets showing this particular value, I've been unable to find anything about it.

What, indeed, are the Right Ascension and Declination angles of the Sun for J2000 ? Wikipedia shows some values (RA = 286.13, Dec = 63.87), but it is not clear whether they are J2000 or not...

**Tags:** the-sun, declination, astrometry, right-ascension
> **Comments:**
> **username_1**: What Wikipedia article gave those coordinates? The Sun's declination on Jan 1 should be more like -23°.  
> **username_2**: I think the coordinates you mention are the RA and Dec. of the direction of the North Pole of the Sun. If you're looking for the RA/Dec. of the position of the Sun in the sky, then they need to be computed based on the date and time, since they change throughout the year. You may be interested in this Wikipedia article : [Position of the Sun](https://en.wikipedia.org/wiki/Position_of_the_Sun). Also, several web services, software and programming libraries can compute them for you (Ex: Pyephem, Skyfield, Stellarium, JPL Horizons, etc.)  
> **username_3**: @FSimardGIS I'm pretty sure that Izhido is asking for the RA & Dec of the Sun at the exact instant of the J2000 epoch, i.e., on the 1st of January 1, 2000, at 12:00 Terrestrial Time.  
> **username_2**: @PM2Ring You're right, he says "at J2000", I guess I misread earlier. Then we need to compute RA/Dec. for January 1, 2000 12:00 TT.  
> **username_0**: @MikeG, check https://en.wikipedia.org/wiki/Sun, in the table at the right side of the page, under "Rotation Characteristics"  

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## 1 answers

### Answer by username_4 on 2020-04-10. Score: 1 | Accepted answer

At noon on 1 Jan 2000 (UT) the sun's RA & dec were (J2000):

18hrs 45min 9.36s

-23deg, 2 m, 8.2s

This is per Guide9 software.

> **Comments:**
> **username_3**: This answer would be better if you use 11:58:55.816 UTC, see https://en.wikipedia.org/wiki/Epoch_(astronomy)#Julian_Dates_and_J2000  
> **username_4**: Thanks, I wasn't aware of that.  To the nearest second, both RA and Dec, it makes no difference.  
> **username_3**: No worries. I didn't expect it to make a significant difference. But since the OP wants the values right at the instant of the J2000 epoch, we might as well do it properly. ;)  

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