Excerpt from Handy Methods of Geodetic Astronomy for Land Surveyors, 1921
To find the Mean Time of any Star's Culmination at any Meridian.
Rule 1. To the Mean Time at 0 hours Sidereal Time in the Ephemeris on the previous day, or the given day, add the Star's Right Ascension reduced to Mean Time by Table p. 79 Whitaker.
(If the two quantities make more than 24 hours take the previous day, if less, take the given day.)
Rule 2. From the Star's Right Ascension, increased if necessary by 24 hours, deduct the Sidereal Time at Mean Noon in the Ephemeris, the result will be a Sidereal interval, which, reduced to Mean Time, will be the answer.
When the Meridian is not the same as Greenwich, the Mean Time, Apparent Time, or Sidereal Time, have all to be corrected for the difference of Longitude, expressed in time.
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