<p>So the <a href="https://www.ucl.ac.uk/%7Ezcapd20/pdfs/jack%20carlyle%202nd%20essay.pdf" rel="nofollow noreferrer">local sidereal time is the right ascension of objects on the Meridian at the given time.</a></p>
<p>Lehi on 25th of February (assuming US style date) is in Mountain time zone, UTC-7,  so 13:30 is 20:30 UTC</p>
<p>Using Stellarium, objects on the meridian at that time and location with an azimuth of 180, have a right ascension of 23 hr 24min 23 seconds (accounting for precession) or 23hr 23min 13sec (with J2000.0 coordinates). So this is the local sidereal time of 13:30 Mountain time in Lehi.</p>
<p>Working the other way, a sidereal time of 13:30 occurs at 10:37 UTC or 03:37 Mountain time.  There is a slight difference if you use J2000 coordinates, it moves it to 03:38.</p>

CC BY-SA 4.0
2023-03-30T07:41:25.657Z
I think the OP says that the sidereal time is 13:30 and they want to check if that corresponds to 3:32 Mountain Time.
PM 2Ring
CC BY-SA 4.0
2023-03-30T16:56:30.800Z
You may be right... working backwards...
James K
CC BY-SA 4.0
2023-03-28T19:29:20.483Z
2023-03-30T17:03:29.203Z
2023-03-30T17:03:29.203Z
James K
<p>13:30 local sidereal time means the first point of Aries was 202.5 degrees west of you. With Lehi at about 111.9 W, the GHA of the first point of Aries was about 314.4. Referring to an almanac and interpolating the UTC time was 1033. With Lehi in CST that would be 4:33 AM.</p>

CC BY-SA 4.0
2023-04-02T15:19:16.153Z
2023-04-02T15:19:16.153Z
stretch
<p>I live in Lehi, Utah, USA and I want to know what time of day it was on sidereal time on February 25th, 2023. Someone said it was 3:32 AM and I wanted to check and see if that was true.</p>

CC BY-SA 4.0
2023-03-28T17:49:09.020Z
Needs detail or clarity (a close reason)
Starship
CC BY-SA 4.0
2023-03-28T17:50:25.620Z
You may want to add your time zone with it's offset to utc
planetmaker
CC BY-SA 4.0
2023-03-28T19:26:56.927Z
Lehi is mountain time,  UTC -7 so 13:30 is 20:30 UTC
James K
<observational-astronomy><galaxy><amateur-observing><universe><time>
How do I find out when sidereal time was 13:30 on a certain date and location?
Lorin Bishop
# How do I find out when sidereal time was 13:30 on a certain date and location?

(Asked by: username_0 on 2023-03-28)

I live in Lehi, Utah, USA and I want to know what time of day it was on sidereal time on February 25th, 2023. Someone said it was 3:32 AM and I wanted to check and see if that was true.

**Tags:** observational-astronomy, galaxy, amateur-observing, universe, time

> **Comments:**
> **username_1**: Needs detail or clarity (a close reason)  
> **username_2**: You may want to add your time zone with it's offset to utc  
> **username_3**: Lehi is mountain time,  UTC -7 so 13:30 is 20:30 UTC  

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## 2 answers

### Answer by username_3 on 2023-03-28. Score: 3

So the [local sidereal time is the right ascension of objects on the Meridian at the given time.](https://www.ucl.ac.uk/%7Ezcapd20/pdfs/jack%20carlyle%202nd%20essay.pdf)

Lehi on 25th of February (assuming US style date) is in Mountain time zone, UTC-7, so 13:30 is 20:30 UTC

Using Stellarium, objects on the meridian at that time and location with an azimuth of 180, have a right ascension of 23 hr 24min 23 seconds (accounting for precession) or 23hr 23min 13sec (with J2000.0 coordinates). So this is the local sidereal time of 13:30 Mountain time in Lehi.

Working the other way, a sidereal time of 13:30 occurs at 10:37 UTC or 03:37 Mountain time. There is a slight difference if you use J2000 coordinates, it moves it to 03:38.

> **Comments:**
> **username_4**: I think the OP says that the sidereal time is 13:30 and they want to check if that corresponds to 3:32 Mountain Time.  
> **username_3**: You may be right... working backwards...  

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### Answer by username_5 on 2023-04-02. Score: 0

13:30 local sidereal time means the first point of Aries was 202.5 degrees west of you. With Lehi at about 111.9 W, the GHA of the first point of Aries was about 314.4. Referring to an almanac and interpolating the UTC time was 1033. With Lehi in CST that would be 4:33 AM.


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