A tweet from Twitterverse: 

I’d say aligned with the earth’s poles - as ‘vertical’ depends on your frame of reference.


When does the line between day and night become vertical? , September 22 at 19.21 UTC, there will be an equinox on planet Earth [watching solstices and equinoxes from space:]


A tweet from Twitterverse: 

I guess I could leave astronomy, but astronomy never really left me.

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