Charles Todd's observations of the transits of Venus

Details Charles Todd's observations of the transits of Venus Charles Todd's observations of the transits of Venus

Jun 2004

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2004jahh....7....1e&link_type=abstract

Journal of Astronomical History and Heritage (ISSN 1440-2807), Vol. 7, No. 1, p. 1 - 7 (2004).

Astronomy and Astrophysics

Astronomy

1

1874 Transit Of Venus, 1882 Transit Of Venus, C. Todd, Adelaide, Wentworth

Scientific paper

The scientific importance of the 1874 transit is evidenced by the number of international expeditions undertaken in order to observe it, with their goal being the determination of the astronomical unit. Charles Todd, the first Government Astronomer and Superintendent of Telegraphs in South Australia, observed the transit from Adelaide with a newly purchased 203-mm (eight inch) Cooke equatorial. Although ingress was clouded out, Todd successfully observed the egress, and noted evidence for Venus' atmosphere as the planet moved off the Sun's disc. This had first been noticed during the transits of 1761 and 1769, but the effect was not widely known to observers of the 1874 transit. For the 1882 transit Todd travelled to Wentworth, where he was one of few observers in Australia to be favoured by clear skies.

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