Pic Title: Sunspot relative number
Related Phrase: 黑子相对数
Related pictures: Sunspot relative number
Source: http://c61.cnki.net/
Pic Description: Yunnan Observatory sunspot number reliability explore - "Astronomical Research & Technology" 1998 04 - Yunnan Observatory sunspot number reliability explore - "Astronomical Research & Technology" 1998 Section 04 - | |
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