manifestation
发表于 2025-3-30 11:04:31
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Corral
发表于 2025-3-30 14:28:56
Selected Areas,wide consensus, Kapteyn proposed his Plan of Selected Areas. This work, co-ordinated from Groningen, was designed to collect as much information as possible on as many stars as possible in a set of over 200 carefully selected small areas all over the sky. The ultimate purpose was to derive the distr
dainty
发表于 2025-3-30 20:21:11
Extinction,y dust, which was vital for making a correct model of the distribution of stars in space, was recognized early. If it existed, it could mean that the Sun was in a preferred position in space, which Kapteyn found difficult to accept. Part of a possible extinction would be the result of scattering of
blithe
发表于 2025-3-30 21:16:29
Students,determination of the Solar Apex) and Lambertus Yntema (on measurements of the background star light). Kapteyn was also offered the directorship of Leiden Observatory, when the older van de Sande Bakhuyzen died. He declined but Leiden followed his advise to appoint de Sitter as professor of astrophys
BALE
发表于 2025-3-31 04:18:46
Mount Wilson,t a few months there every year. His first visit to Mount Wilson, in 1908, coincided with the completion of the 60-inch telescope, the largest in the world at the time. George Hale, the founder of the Observatory, adopted Kapteyn’s Plan of Selected Areas as the main observing program for his new tel
hypnotic
发表于 2025-3-31 05:48:57
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有害
发表于 2025-3-31 11:17:54
First Attempt, Sidereal System but also in the area of stellar properties. Kapteyn performed various studies on the distances of particular groups of stars. He became involved in a serious clash of opinion with Adams and the two broke up their collaborations to measure radial velocities in relation to the Plan of