Scope and Contents

Comprises four files labelled as follows: 'Analysis of Time Group Difference (Time Group Corrections)'; 'Analysis of Group Differences (General) (also applicable to both time and latitude)'; 'Observed Group Differences (Time, Latitude and Prism Angle'; 'Latitude Group Differences and Group Corrections'.

Scope and Contents

Comprises sets of papers labelled as follows: 'Time Results'; 'Mean Time and Latitude Plots'; 'Analysis of Latitudes: Latitude Observer Corrections'; 'Analysis of Times: Observer Corrections (Clock Corrections) '.

Scope and Contents

Papers from a file labelled 'Cape Astrolabe: Planet Observations (Saturn, Mars, Vesta)'. Comprises a data table for each planet, dated 1965-1967, accompanied by a note from J. D. Laing dated 10 March 1971.

Note: The data tables are each made up of several pieces of paper that were glued together in the past, and this adhesive is beginning to fail. One of the tables is in loose pieces. Handle with care.

Scope and Contents

Papers from a file labelled 'Cape Astrolabe: Corrections to Adopted ZD's [zenith distances] of Standard Stars'. Comprises tabulated data detailing stars and their mean Dzeta values. Accompanied by a note dated 13 November 1972.

Scope and Contents

Papers from a file labelled 'Cape Astrolabe: Double Stars'. Comprises a set of tabular data and a set of circular diagrams. The diagrams are initialled J.D.L.
Note: One of the data tables is each made up of several pieces of paper that were glued together in the past, and this adhesive is beginning to fail. Handle with care.

Scope and Contents Notes and data on astrolabe operations sent by J. D. Laing at the Royal Observatory, Cape of Good Hope, to D. V. Thomas at the Royal Greenwich Observatory. Comprises punch card with notes on reverse; data print-outs, a letter from J. D. Laing to D. V. Thomas; punching instructions sheet for Cape Astrolabe data corrections; notes on assembly of data cards; and tables of 'Duty' card data. With a postal envelope addressed to Dr D. V. Thomas which has been labelled 'Duty...

Scope and Contents

Comprises two graphs titled 'Observed latitude' and 'Cape Astrolabe UT2 (observed) - UTC'.

Scope and Contents

Papers from a file labelled 'Machine Section: Astrolabe Reductions for Cape'. Comprises papers papers relating to a computer programme, Cape Astrolabe Reduction Job 187. Includes punch card layouts, notes on operating procedure, test outputs and a progress sheet.

Scope and Contents

Papers from a file labelled 'Machine Section: Astrolabe Reductions'. Comprises papers relating to a computer programme, Cape Astrolabe Reduction Job 177. Includes summary of stages of procedure, punch card layouts, summary of the procedure for preparing punch cards, test outputs, and a progress sheet.

Scope and Contents

Comprises two graphs, labelled 'Accumulated Clear Night at Cape'; and 'Nominal Accumulated Clear Night at Cape for Period 1965 May to 1968 December'; and a duties chart labelled 'Provisional Cape Astrolabe Programme'.

Scope and Contents

Papers from a file labelled 'Section C87D: Astrolabe Programme Description etc'. Comprises computer run request cards, computer run records, notes describing program C87/D, observer and group corrections for the program, coding forms, flowchart, various handwritten notes, and untitled graphs.

Scope and Contents

Papers from five files labelled as follows: 'C87X, C87W'; 'C87/E'; 'C87 card layouts, MT layouts'; 'C87F'; C87E'. The folders comprise lists of program runs; overviews of the programs; lists of magnetic tapes; computer run request cards; coding layouts; print-outs and other papers.

Scope and Contents

Papers from a file labelled 'C87D Coding Forms'. Comprises coding forms and punching instructions written by David Thomas for the program C87/D.

Scope and Contents

Papers from a file labelled 'C87.Y,Z (Produce Cape Astrolabe Working Catalogue)'. Comprises computer run request cards, print-outs, coding forms, and other notes.
The programmes were created by David Thomas. Coding forms date from 1971; computer listings date from 1973.