Nine volumes of printed recording 'Computation[s] of Tabular Errors of Longitude and Ecliptic N.P.D., from the Observed Tabular Errors of R.A. and N.P.D., for the Sun, Moon and Planets ... (By means of the Numbers in the Appendix No. II to the Greenwich Astronomical Observations for 1836)'. Handwritten entries on printed Forms No. 115. There is a large gap in the series with volumes only for the following date ranges: 1890-1900 and 1911-1954.

Seventeen volumes recording 'Apparent errors of the Sidereal Standard Clock, and adopted clock rates and clock errors at 0h Sidereal'. Handwritten entries on printed Forms No. 8 and 8*. From 1931, Form No. 8 has the new title, 'Transit Circle. Observed correction to Sidereal Standard Clock, and adopted clock correction and rate at 0h Sidereal'. There are many gaps in the book sequence with only the following date ranges covered: 1806-1813, 1899-1911, 1919-1921, 1929-1940.