On Monday, March 27, 2023 at 12:44:53 AM UTC-6, Gerald Kelleher wrote:
You are a long way from objecting to the notion that everything to the
left of the Sun is a twilight appearance and to the right of the Sun is a morning appearance.
Things in the ecliptic plane, relatively close to the Sun in the apparent sky, would indeed be
vespertine on the left and matutine on the right, using the terminology of ancient
astrologers. That much is true enough.
Off the plane of the ecliptic, of course, the fact that the celestial equator is a band in the
sky at an angle depending on one's latitude could make things mostly above and below
the Sun behave differently. Thus, even if also slightly to the right or left of the Sun, in
the Northern hemisphere, things above the Sun would be visible both before sunrise and
after sunset.
And things visible in the middle of the night, halfway around the ecliptic from the Sun,
might be on the right or the left without being particularly associated with dawn or
sunset.
So are these the sorts of objections you feel he to whom you replied lacked the wit
to make, or are there even more subtle objections that a true astronomer needs to know?
John Savard
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