$ echo 20+5/2 | bc22$ echo ‘scale=4;20+5/2’ | bc22.5000
shell – How to do integer & float calculations, in bash or other languages/frameworks? – Unix & Linux Stack Exchange
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Aurora Australis Forecast
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Aurora forecast for Australia and New Zealand. Featuring hourly and daily Southern Lights forecasts along with live solar wind data.
Source: Aurora Australis Forecast
Astrophotography Basics: SNR
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M27
M27 at Tai Au Mun
29-7-2016
D5300 30 x 2 min
ED80sf with reducer, IDAS D1 filter
GP2 with raspberry pi auto guiding
Dark and Bias frame
DSS, Pixinsight LE, PS
Single frame (2 min)
長沙渡假屋: 觀星好地點
一屋可住八人 ，9 號屋有三間房共 3 張雙人床和兩張單人床，特大廚房，我估全屋有千五尺，室外還有燒烤爐和羽毛球埸，最奇有個沖身埸😄
附近就有全港最長的沙灘: 長沙👍
有機會一定要和星友們來宿一燒😎
香港夜空光度監察網絡 Hong Kong Night Sky Brightness Monitoring Network (NSN)
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Astro forums
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熱烈祝賀星友點踏入兩週年
如题
Astrophotography by Dave Kodama
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Regim
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