On Sat, Apr 1, 2023 at 5:36 PM Troy Prideaux <troy@xxxxxxxxxxxxxxxxxxxxx>
wrote:
Or you could maybe cheat by using a hi-res video cam with the IR+UV filter
replaced with a 1um bandpass or longpass. That should make the sky black
provided it's clear.
Troy
with a
You can see some of the brighter stars from the ground during daytime
telescope if the air is clear. A blue filter helps.