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You need to know what the Local Sidereal Time (LST) is. The RA of an object on the meridian is the LST at your location. eg when the Orion Nebula is overhead the LST is about 5hr 32min. LST runs about 4 minutes faster than clock time.
You can download an LST clock from various sources. Most astro software has LST time.
The LST at 3:54pm is 19hr 11min. Orion will be overhead in about 10 hrs.
Last edited by astro744; 26-11-2009 at 03:56 PM.
Reason: added LST at 3:54pm
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