Recently, both the Android and iOS versions of Sun Surveyor were updated with some additional Moon-related features:
- Super Moon finder! – when the moon is within 360,000km (223,694 mi) of the earth during a full or new moon, the distance is highlighted to indicate this special occurrence
- Position angle of the bright limb relative to the observer – in plain English, the moon will now appear as it does in the sky, tilted appropriately as it will appear at the selected location, so visualization of “smiling moons” and more is now possible
- Moon Distance, Next Apogee and Perigee – times when the moon will be furthest or closest to the Earth, respectively
- Moon Age – in days from the last new moon
- Moon Phase times – previously, only the date was shown
A user from the Southern hemisphere challenged me to implement the bright limb angle feature, since moon phases like first quarter and last quarter appear “reversed” below the equator and the app was showing a northern hemisphere bias by reflecting a fixed rotation (i.e. as seen in this article). I thought it would be nice to provide the other features and information while at it.
To find upcoming super moons, simply set the slider mode to 1 year, and scrub through the year until the upcoming moon phases indicates a super moon via the indicator seen below.