... Armagh Observatory, College Hill, Armagh BT61 9DG, +44 (0)28 3752 2928 . ... This is a scanned version of the 1920 edition of Ellison's The Amateur's Telescope . ... This 1920 version is being provided on-line free of charge as part of the Observatory's wider educational and charitable objectives, but those who plan to download it (or a significant part of it) for their own use are asked to consider making a small donation to the Armagh Observatory by way of exchange. ... X. Testing and Figuring . ...

... 1900--1994: 42.4 +/- 9.06 inches . 1900--1920: 39.0 +/- 6.91 . 1920--1940: 35.1 +/- 4.50 . 1940--1960: 40.9 +/- 7.35 . 1960--1980: 48.1 +/- 8.03 . 1980--1994: 50.1 +/- 7.60 . ... To the Weather Page . To the Home Page . ...

. Bright Supernovae - 2009 . This data comes from IAU Circulars and occasionally more data will be provided on IAU 's Astronomical Headlines page. An archive of the 2009 updates to this page is available. This is a list of the supernovae discovered in 2009. For supernovae which are still visible, please look at the main page for the latest data. Note that Extra galactic Novae have been moved to a special Extra galactic novae page . For more information, you can look at the following Supernova Catalogs: .

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