View Full Version : September New Moon Spotting

2010-Sep-08, 06:52 AM
Who will be the first to spot the September New Moon with naked eyes after sunset? The Dark Moon will be in geocentric longitudinal conjunction with the Sun on 2010 SEP 08 at 10:30 UT (05:30 CDT). We’re near the autumnal equinox, which is the worst time of year for sighting really young Moons from north of the tropics. This month’s waxing crescent Moon will be near its maximum latitude south of the ecliptic, which increases the negative effect of the ecliptic’s sharp intersection with the dusk horizon at this time of year.

North Americans will likely find it impossible to find the Moon until it is more than 2.5 days old on September 10. That evening it will be about 10% illuminated, making it Diana’s Bow which is named after the archery equipment of the ancient Roman goddess of hunting and the Moon. It will be interesting to see who accepts and succeeds with the tough challenge this month.

I’ve created two graphics previewing the western sky after sunset on September 10 & 11. They both should well serve most North American observers. The Moon will appear beneath the triangle of Venus, Mars & Spica on September 10 and to the left of that group during the following evening. The previews can be seen by clicking: http://www.curtrenz.com/astronomical then going to the Moon page.

Photos and descriptions of the September New Moon would be welcome additions to this thread. Please include the date, time, time zone and location. Good Luck!

Below is a photo I took from Arlington Heights, Illinois after sunset on 2007 SEP 13 of a 2.5-day-old Moon under circumstances similarly difficult to this month.