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Script for 'The Night Sky in August', 1954-08

Reference Code: GBR/0180/RGO 45/289

Scope and Contents

A copy of Porter's script for 'The Night Sky in August' on statistical methods in astronomy; the Plough and the movement of Arcturus over 1,800 years since the time of Ptolemy, which Edmond Halley called attention to in 1718; the proper motions of stars, including Arcturus, Sirius and Procyon, analysed statistically by William Herschel, giving similar results to modern measurements; stellar velocities determined by spectroscopic analysis, the velocities increasing towards the galactic centre; revolution about the galactic centre and variations of the movements, with star clusters such as the Pleiades and Hyades moving together; Sirius and the Plough also being part of a local cluster; and radio telescopes receiving signals from the centre of the galaxy.


  • Creation: 1954-08


Conditions Governing Access

From the Management Group:

Unless restrictions apply, the collection is open for consultation by researchers using the Manuscripts Reading Room at Cambridge University Library. For further details on conditions governing access please contact Information about opening hours and obtaining a Cambridge University Library reader's ticket is available from the Library's website (


5 page(s)

Language of Materials


Finding aid date

2007-04-13 12:40:42+00:00

Includes index.

Repository Details

Part of the Cambridge University Library Repository

Cambridge University Library
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Cambridge CB3 9DR United Kingdom