----- Original Message -----
From: "Jeff Medkeff" <jeff@...>
To: <guide-user@yahoogroups.com>
Sent: Sunday, December 22, 2002 1:12 PM
Subject: Re: [guide-user] C/2002 X5


>
> It is not at all rare for a comet to be observable in both the morning and
> evening sky of the same day at either northerly or southerly latitudes.
The
> farther poleward the observing site and/or comet, the more common the
> circumstance is.

Indeed. The obvious case when this is true is when the comet is sufficiently
close to the pole to be a "circumpolar" object, which is always above the
horizon. In that situation it is, self evidently, visible whenever the sky
is sufficiently dark!

Regards,

Chris
---------------------------------------------------------------
Chris Marriott, SkyMap Software, UK
e-mail: chris@... Web site: http://www.skymap.com
Astronomy software written by astronomers, for astronomers