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The ephemeris gives the apparent geocentric positions of the Sun, Moon, and planets (i.e. the positions are as seen from the centre of the Earth). The longitudes, given daily, may be interpolated to any particular instant of time using the daily motions given on pages 26-28. The accuracy of the longitudes thus obtained is 1 arcsecond for the Sun, 1 arcminute for Venus and Mara, 2 arcminutes for Mercury, and 4 arcminutes for the Moon. The accuracy for the Moon can be improved to 1 arcminute if the values for 24h are used in conjunction with those for 12h, and the differences taken by hand. The latitudes and declinations of the Moon can be interpolated to an accuracy of several minutes of arc.