One of the mysteries of the English language finally explained.
A great circle in the celestial sphere passing through the zenith and the east and west points of the horizon.
- ‘Regiomontanus, however, is based upon an equal division of the equator rather than the prime vertical - it is the same method as that suggested by Morinus, but bows to convention by commencing from the ascendant.’
- ‘For star observations a star should be selected which will be about three hours from the meridian and near the prime vertical at the times of observation.’
- ‘For the observations closer to the meridian than the prime vertical, make the calculation of latitude with the estimated longitude.’
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