- Astronomical Data and Tides
Astronomical Data and Tides
11 May 2021
Sunrise and Sunset
Moonrise and Moonset
High and Low Tides
Sunrise/sunset and moonrise/moonset information is obtained from the U.S. Naval Observatory.
The moon revolves around the earth, making its position relative to the sun change about 12 degrees each day. This in turn causes the moon to rise and set at different times each day, with each time occurring later than the day before.
As the time of occurrence between two consecutive moonrises is about 50 minutes beyond the 24 hour day, depending on your location on Earth, there are some days without a moonset; that is, if today’s moonset is less than 50 minutes before midnight, there will be no moonset tomorrow, and the next moonset will fall after midnight the day after. If the moonset today is more than 50 minutes before midnight, the next moonset will fall tomorrow.
The tidal information is obtained from the Maritime and Port Authority (MPA) of Singapore. Tidal height is in metres above the ‘Chart Datum’, which is the lowest water level recorded over a fixed period (usually 18 years) at a particular point