scholarly journals Total solar eclipse of 1900 (May 28). Preliminary report on the observations made at Bouzareah (in the grounds of the Algiers observatory)

1901 ◽  
Vol 67 (435-441) ◽  
pp. 346-369 ◽  

The Report is presented in three parts. Part I. Origin of the Expedition and General Preparations by the Two Observers jointly (§§ 1—10). Part II. Separate Report by Professor Turner. §§ 11—12. The Cameras and Coelostat. § 13. The Polariscopes. §§ 14—16. Adjustments. §§ 17—19. Programme of Observations. §§ 20. The Standard Squares. § 21. Use of Green Screen. § 22. Integral Photometer. § 23. Development.

1899 ◽  
Vol 64 (402-411) ◽  
pp. 21-26 ◽  

In the month of August, 1897, I was invited by the Joint Permanenta Eclipse Committee to take part in observing the total solar eclipse which occurred in India on 22nd January of the present year. The preparation of the equipment, which will be described further on, was at once proceeded with, and by the sanction of the Univer­sity authorities and the Secretary for Scotland I was granted the necessary leave of absence from the University and the Royal Observatory.


The expedition to which this report refers was one of those organised by the Joint Permanent Eclipse Committee of the Royal Society and the Royal Astronomical Society; it was supported by a grant made by the Government Grant Committee. Guelma was chosen for the site of the observations, as being an inland station between Sfax, which was selected for an expedition from the Royal Observatory, Greenwich, and Philippeville, which it was at first expected Sir Norman Lockyer would occupy. Guelma is 58 kilometres from Bona, 65 kilometres from Philippeville, 55 kilometres from the nearest coast of the Mediterranean Sea; it lies at a height of about 1200 feet above sea-level on the south side of the Valley of the Seybouze, amongst hills which range in height from about 3100 feet at 13 kilometres to the north, to about 4700 feet at 11 kilometres on the south, where lies the celebrated mountain, Mahouna, “the sleeping lady,” so called from the resemblance of its silhouette to the form of a woman. (For the position of the observing hut, see p. 59.)


1. General Objects .—The particular pieces of eclipse work kept steadily in view by the writer during recent years are— ( a ) The determination of the brightness of the corona by photographic methods at different distances from the sun’s limb. ( b ) The determination of the fraction of this light radially polarised. Attention was directed to both these objects on the present occasion and in addition an opportunity presented itself of making a trial of— ( c )The use of long focus mirrors in eclipse work.


1899 ◽  
Vol 64 (402-411) ◽  
pp. 43-61 ◽  

This expedition was one of those organised by the Joint Per­manent Eclipse Committee of the Royal Society and Royal Astro­nomical Society, funds being provided from a grant made by the Government Grant Committee. The observers are indebted to the Great Indian Peninsular Rail­way Company for the carriage of the instruments at reduced rates between Bombay and Pulgaon, and for a considerable reduction of fares to the observers for this journey.


2019 ◽  
Vol 15 (S367) ◽  
pp. 43-47
Author(s):  
Jay M. Pasachoff

AbstractThis paper summarizes preliminary scientific observations from sites in Chile and Argentina from which the totality was observed on 14 December 2020 at the minimum of the solar-activity/sunspot cycle.


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