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Sky & Telescope - April 2015

Sky & Telescope - March 2013

天文觀測 I Optical Telescope. Telescope The main purposes of astronomical telescope: –To collect the weak light (photons) from sky. –To map the sky to image

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Astronomy lub of Tulsa Observer April 2013 · Pocket Sky Atlas by Sky & Telescope On Amazon.com for $ 15.85 regular $ 20 Also Now on KINDLE at $ 9.99 NEWS NOTE: oth Sky & Telescope

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