On this day … 24 November 1639

Jeremiah Horrocks observed and recorded the transit of Venus at Carr House in Much Hoole, where he was living and probably working as a tutor to the children of the family there.

The transit of Venus is rather like a solar eclipse by the moon, except that the planet being very much further away from the earth appears as a small dot crossing the surface of the sun. This is not the place to discuss its significance for astronomers (for that, see the sources below).

Another point is that the above date is somewhat misleading, for at that time Britain was still using the Julian calendar whereas Catholic Europe had adopted the Gregorian calendar, introduced by Pope Gregory XIII in 1582. The Protestant countries of Europe gradually adopted it, Britain doing so in 1752, which meant that until then British dates lagged behind those of other European countries.

Going by the Gregorian calendar, Horrocksโ€™ transit occurred on 4 December. The transit is an extremely rare but regular occurrence (the last was on 5 and 6 June 2012, and there will not be another one until December 2117).

The members of the British 1874 Transit of Venus expedition to Hawaii. Henry Barnacle is the figure sprawled at the front of the group. It appears in a paper by Michael E. Chauvin entitled โ€˜Astronomy in the Sandwich Islands: The 1874 Transit of Venusโ€™ in The Hawaiian Journal of History, vol. 27 (1993). Prof Chauvinโ€™s short article provides a very readable guide to the expedition: https://evols.library.manoa.hawaii.edu/server/api/core/bitstreams/f217d68c-65a9-4f65-b13f-3227fd345c55/content

There were two transits in the nineteenth century, in 1874 and 1882. Britain prepared a major undertaking to observe the 1874 transit, with expeditions to five far flung observation sites, including one to Hawaii. Accompanying the Hawaii expedition was a young astronomer named Henry Glanville Barnacle, later to become principal of a Preston college.

In all the various articles, biographies and obituaries relating to Barnacle, the one event in his life that is invariably remarked on is his time as an astronomical observer on that expedition to Hawaii. And yet it is probably the event in his life he would most wish forgotten.

It was the biggest and most embarrassing failure of Barnacleโ€™s long life, as was revealed when unpublished journals kept by other members of the expedition, deposited in the Royal Greenwich Observatory Archives, were put on line.

The journals were kept by Captain George Lyon Tupman, the expedition leader; Professor George Forbes, the lead astronomer on the observation sub-station to which he and Barnacle were assigned; and Lieutenant Evelyn Noble, who filled his journal with caricature sketches of expedition life.

Henry Barnacle cartoon
A caricature of Barnacle by Lieutenant Noble: https://cudl.lib.cam.ac.uk/view/MS-TRANSIT-00001/32

Prof Forbesโ€™ journal contains the following entries relating to Barnacle, with a rather damning addition by Captain Tupman:

โ€˜September 9. Arrived at Honolulu.
‘After the instruments for Honolulu were pretty well in order I unpacked and mounted the Garnett transit so that Mr Barnacle might have some practice; his observations at Greenwich having been of a desultory nature, and his reductions of observations unsatisfactory.
โ€˜October 5-7. I was occupied in adjusting the instrument and placing it in the meridian. From this time until we left Honolulu Mr Barnacle โ€ฆ made observationsโ€ฆ These were unsatisfactory, and his reductions showed such ignorance of the elements of astronomy that I โ€ฆ gave up thoughts of wasting time by attempting to instruct him.โ€™

In the margin of the facing page, Tupman has added and initialled the following comment:

โ€˜Mr Barnacleโ€™s conduct at Honolulu was so extraordinary, we, and I may say the entire community, thought he had gone out of his mind. I sent him home immediately after the transit, and perhaps ought to have done so before. GTโ€™.

In his own journal Tupman writes:

โ€˜Nov 1. โ€ฆ Mr. Barnacle is apparently out of his mind. Nothing will induce him to discontinue playing the same tune over and over again on the piano forte. I doubt if I ought to send him back to England immediately, as it is almost impossible to get any work of him & no faith can be placed in anything he says โ€ฆโ€™
โ€˜January 2. Saturday. โ€ฆ A schooner was leaving today for Honolulu, so Messrs. Biggs and Barnacle left in her, the former to rejoin his ship, the latter to catch the English mail.โ€™

Tupman in his journal briefly records Barnacleโ€™s departure, and gives a final verdict on his departing astronomer: โ€˜Jan 11. โ€ฆ Mail left for San Francisco Mr Barnacle sent in her as he is no manner of use here and brings daily fresh discredit on the expedition โ€ฆโ€™

St John's College, Grimsargh, lancashire
St Johnโ€™s College, Grimsargh: From Tom Smithโ€™s History of Longridge.

Barnacle returned to Britain where he turned from astronomy to the Anglican Church, in which he was ordained and which he served as a minister, until his move to Preston in 1898 as the principal of St Johnโ€™s College, Grimsargh. The college was well-established, with โ€˜upwards of 100โ€™ pupils a few years before his arrival.

He left Preston at the age of 61 in 1911, taking his family to Australia to become rector in the town of Mount Barker in Western Australia. He served there and in Rosalie, now a district of Perth, until his retirement in 1933. He died at the age of 89 in 1938 in Subiaco, Perth.


Sources
Henry Barnacle biography
Paul Marston of UClan prepared course notes for his Great Astronomers in History distance learning course and an extensive extract from them was included in the reports that accompanied a conference at UCLan at the time of the 2004 transit:
https://transit-of-venus.org.uk/conference/history.html


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