Asslamo Allaikum,
Adopted from How to Locate the Crescent Moon in Cloudy Weather? by Qamar Uddin
- First, obtain information on when and where the moon will be visible for your location. At a minimum, you need to know the following which can be obtained from Moon_Viz or calculated using Accurate Times
- The sunset/moonset times
- and the azimuth (direction) of the sun and moon at sunset times.
- Identify a high location with clear western horizon, down to ground level, without any obstruction from buildings, trees, hills or mountains. The crescent moon always appears near the sunset position, which differs, from winter to summer months (WSW to WNW in the UK).
- Visit the location on a clear day near the date of observation and note the position of the sunset with respect to the landscape. Take a photograph of the sunset position and note the date/time and other camera settings (e.g. shutter speed, focal length etc), which can be used to predict the moon position on another day. Photograph of sunset on 3 April 2011 with moon track prediction added (with Red Shift 6) for 4 April 2011 (see photograph 1, below)
- For technical observers:
- Use suitable astronomical software to predict the direction of the moon from the sunset to moonset times see software like Skyview
- If you have an andorid phone use google skymap on the day (see photograph 2, below)
- The example (photoggraph 1) shows how the above techniques have been used by members of York Astronomical Society to predict the position of the crescent moon on a cloudy day (4 April 2011) with a sunset photograph from a clear day (3 April 2011), (see photograph 3, below)
Picture 1:

Picture 2:

Picture 3:


