アメリカ自然史博物館のインスタグラム(amnh) - 5月9日 21時28分

Attention astronomers! Don’t miss today's solar transit by Mercury.
Seen from Earth, Mercury appears to cross the Sun’s disk on May 9. The event is first of its kind since 2006, and is best experienced online or on television, unless you’re knowledgeable about how to use a telescope safely for solar observing. NASA will have live coverage of the Mercury transit on May 9.
During the transit, begining 7:12 am Eastern Time and concluding 2:42 pm, Mercury appears as a tiny black dot, gradually progressing across the solar disk.
Image: NASA

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