3 ms·

They reflect sunlight for some period of the evening and morning, before the sun is shining where you are and illluminating the sky too much.

• KeplerBoy 3y ago
  so not in the middle of the night.
  • CrazyStat 3y ago
    That depends on the altitude. GPS satellites at 10000km can be lit up in the middle of the night. Starlink satellites at 500km can’t.
    • KeplerBoy 3y ago
      Ah yes, of course you're right. After all the moon is nothing but a satellite either.
• wolverine876 3y ago
  Between when the sun first disappears below the horizon and when (nearly) all its light disappears, i.e., the end of astronomical twilight when the Sun's center is 18 deg below the horizon, seems to be about 90 minutes. https://www.timeanddate.com/astronomy/different-types-twilight.html https://www.timeanddate.com/astronomy/different-types-twilig... It's been awhile, but I'm pretty sure I've seen these much later than that. I'm talking about lying in a sleeping bag, looking up at the amazing starfields of pitch-black wilderness nights (tip: never use a tent except in extremis - look what you're missing!).