作者flyingwave (飛翔的波)
看板sky
標題[問題] 天文雜誌中句子的疑問
時間Tue Mar 31 22:07:44 2009
The second scale is given in the well-known
astronomical scale of magnitude
per arc second (mag/sec2) in the visual range (V-band). This gives the
brightness of the sky of one square arc second. The natural level is around
21.6 mag/sec2 at a solar activity minimum.
不懂紅色字的地方 請高手解惑~thx
--
※ 發信站: 批踢踢實業坊(ptt.cc)
◆ From: 140.115.42.223