Re: Observing Polaris


"Paul.Lee.1971@xxxxxxxxx" <Paul.Lee.1971@xxxxxxxxxxxxxx> wrote in message
news:46df71c5-b346-4481-b94c-d9527aa962d9@xxxxxxxxxxxxxxxxxxxxxxxxxxxxxxx
| Hi,
| When is the best time to observe Polaris (obviously from the northern
| hemisphere!): is it between the periods of civil, nautical or
| astronomical twilight?
|
| Many thanks!
|
| Paul
The best time to observe Polaris (or any other star for that matter) is
(in this order)
a) at night
b) when there is no cloud cover
c) in winter
d) when there is no light pollution from terrestrial sources
e) when there is no Moon in the sky

Twilight is sunlight scattered and refracted by atmosphere and
is a vague and ill-defined term which begins when the sun drops
below the horizon and may last all night, depending on latitude.
Observed from the equator Polaris is on the horizon and you
are seeing through the thickest part of the atmosphere, so the best
time and place is when it is midnight in winter at about latitude
40 - 66, say Canada or Northern Europe.

--
Androcles

Why did Einstein say
the speed of light from A to B is c-v,
the speed of light from B to A is c+v,
the "time" each way is the same?

http://www.androcles01.pwp.blueyonder.co.uk/



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