[eggy]

Well, if we're nitpicking here, it is not 86,000s/day (24 hours * 3600s/hour) and 7.27x10^-5 radians/s, but 86,164.091s and 7.29x10^-5 radians/s.

24 hours is the time it takes the sun to return to the same spot in the sky due to earth having to rotate for another 3m56s to make up for angle gained by revolving around the sun in the same direction as the rotation of the Earth. This applies for the other planets that also rotate and revolve in the same direction - Mercury, Earth, Mars, Jupiter, Saturn, and Neptune. A sidereal day is 23h 56m 4.091s for distant stars to return to the same spot in the sky.

Damn, I knew that is why I botched my 6-stop exposure at my daughter's graduation! She can't blame me now! Thank you HN!

[trhway]

>Damn, I knew that is why I botched my 6-stop exposure at my daughter's graduation!

how about driving for 6-stop before taking the shot a tank with stabilized gun trained to the target. Now the tank gunner has the excuse too.

[eggy]

I shot competitively in JROTC and after, but never out to 1000 yards (914 m), only 500 yards. The Earth's rotation affects your trajectory significantly particularly if you are shooting longitudinally at a target at a higher or lower latitude. The Coriolis effect. I had more issues with varying winds or being consistent across shots.