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A tweet from Twitterverse: 

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

RT @Rainmaker1973@twitter.com

When does the line between day and night become vertical? , September 22 at 19.21 UTC, there will be an equinox on planet Earth buff.ly/35VbD4P [watching solstices and equinoxes from space: buff.ly/1Qe1hk7]

🐦🔗: twitter.com/Rainmaker1973/stat

A tweet from Twitterverse: 

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

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