Free and Discounted Ebooks
Join 130,000 readers! Get our ebook deals straight to your inbox.

A Plan for Securing Observations of the Variable Stars

Cover image for


Author: E.C. Pickering
Published: 1882
Language: English
Wordcount: 5,546 / 24 pg
Flesch-Kincaid Reading Ease: 57
LoC Category: QB
Downloads: 331
Added to site: 2011.09.28 30821
Genre: Science

Wherein Pickering says that astronomers must rely on amateur of astronomy for the vast material needed.

Show Excerpt

according to such a method that all the observations can ultimately be reduced to the same system. Herschel and Argelander have independently invented what appears to be the true method to be followed. If a star is seen to be very nearly equal to several others, from their light we can at any time define its brightness. It is essential that at least one of the stars selected should be a little brighter, another a little fainter, than the star to be observed. The range within which its light is known is thus also defined. Such observations will far exceed in value any direct estimate of magnitude. When stars are to be compared many times, it is convenient to designate them by letters for brevity. Let vrepresent a star which is suspected to be variable, and a an adjacent star of nearly equal brightness. Owing to fluctuations in the atmosphere, each star will appear to be constantly varying in brightness. If the stars appear equal after a careful examination, or if one appears brighter as ofte



Join 120,000+ fellow readers! Get Free eBooks and book bargains from ManyBooks in your inbox. 

We respect your email privacy

login | register

User ID


reset password

Author of the Day

Michael Maxwell
When Micheal Maxwell isn't travelling the world with his wife, you are most likely to find him somewhere between Central Valley and the Sierra Nevada Mountains of California. If you do, and you have a chat with this interesting man, take care - you might just end up in a scene of one of his books! Maxwell loves writing character-driven mysteries about everyday people, books with heart that readers can relate to. In this interview, Maxwell reveals how Diamonds and Cole was inspired by a song, how he created Cole Sage and talks about his writing habits.
Read full interview...