observers who claim that they spotted a crescent
moon before sunset or within 10 minutes after sunset
should show proof with pictures. This means a
picture of a crescent with the sun in it as well if
it is before sunset. Digital cameras all now have
time stamps to verify the time of the image, so we
can also tell how long before or after sunset the
image was taken.
If the crescent moon is not observed at places
located west of the initial observer then it proves
that the initial observation was incorrect.
When the sun rises in New York, every person sees
it to the west of this. This is the same case with
the crescent moon.
It is highly unlikely that only one or two
observers will see the new crescent moon only to
have it disappear for everyone else who is trying to
see it from the same place or places west of them.