[AZ-Observing] Re: opposing crescents
- From: Tom Polakis <tpolakis@xxxxxxx>
- To: az-observing@xxxxxxxxxxxxx
- Date: Sat, 3 May 2008 17:59:28 -0400
Mark,
Thanks for the heads-up on the opposing crescents. It appears that the S&T
site information may be applying Daylight Savings Time to Arizona. The MST
times are:
Sunday, 5:09 a.m., 24 hours, 9 minutes before New
Monday, 7:33 p.m., 14 hours, 15 minutes old
S&T gives times when the altitudes of the sun and moon are "balanced." From
past experience with young moon hunting, I am guessing that the best chance for
spotting the moon Monday night will be a little later than 7:33 p.m., when the
moon's altitude above the horizon is less than the sun's altitude below the
horizon. In other words, sky darkness is more important than transparency.
Tom
---- Mark Wainright <mwainright@xxxxxxxxx> wrote:
> Hi,
>
> S&T web site has an article about the opposing crescents on Sunday AM 5/4
> and Monday PM 5/5.
>
> The evening crescent on Monday will be the harder observation. At 8:33PM
> Monday the Sun will be 4 1/2 degrees below the horizon and the Moon will be 4
> degrees above the horizon. The Sun-Moon separation will be 8 degrees 50
> minutes. At that time the Moon will be 15 hours 15 minutes old.
>
> At 6:09 AM Sunday the Sun will be 6 degrees below the horizon and the Moon
> will be 5 degrees above the horizon. The separation will be 14 degrees, and
> the Moon will be 23 hours 9 minutes before new.
>
> The article gives some advice on using the position of the Sun on Saturday
> morning and the position of Mercury on Sunday evening to note the position of
> the Moon on Sunday morning and Monday evening respectively.
>
> Maybe a handful of AZ observers can add to the "Only a tiny handful of
> skilled observers have ever managed to see such "opposing crescents" before."
> mentioned in the S&T article.
>
> Clear skies,
> Mark
>
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