I was wondering if I could do daytime narrowband astrophotography, so I
poked around a bit. Turns out the astro geeks talk about the SR 71 star
tracker as well.
A link they posted from their forum:
http://en.citizendium.org/wiki/SR-71_Blackbird#Astro-Inertial_Navigation_System_.28ANS.29
Not much detail on how it works, just that it did work on the ground.
On Sat, Apr 1, 2023, 9:03 PM roxanna Mason <rocketmaster.ken@xxxxxxxxx>
wrote:
And Venus is one such star-like point which can easily be seen in the
daytime and is the brightest object in the sky after the moon and sun. It's
visible now just after sunset in the western sky.
Ken
On Sat, Apr 1, 2023 at 3:40 PM Peter Fairbrother <peter@xxxxxxxxxx> wrote:
On 01/04/2023 18:40, Jim Davis wrote:
Can stars be tracked at that altitude during the daylight hours? If so,
at what altitude does this become practical?
Some data points:
You can see some of the brighter stars from the ground during daytime
with a telescope if the air is clear. A blue filter helps.
My dad, a WW2 bombadier/navigator, told me he could usually do daytime
astronavigation by bright stars or planets at 23,000 ft, but they were
supposed to use the Sun or Moon instead.
Peter Fairbrother