You can use the time slider below to alter the time of day.
When the altitude of the Sun is 50 minutes below the horizon, then that is the time of Sunset or Sunrise.
Civil twilight begins when the rising Sun is 6 degrees below the horizon or ends when the sinking Sun is 6 degrees below the horizon.
The altitude is the angle of the Sun above the horizon.
The Azimuth is the bearing of the Sun measured clockwise from the northerly direction.
The calculated Sun's position is accurate to about one minute of arc.
The calculations refer to the centre of the Sun's disc. The Sun's disc subtends an angle of 30'. The precise time of Sunset and Sunrise depends on how you define those terms. Whatever definition you use, the values here are accurate to within 2 minutes.
Fill in the boxes below.
The date is in ISO 8601 Date format of yyyy-mm-dd (e.g. 2023-05-13).
Make sure your time is in Universal Time Co-ordinated (UTC), previously known as Greenwich Mean Time (GMT). If your time is in British Summer Time (BST), then subtract 1 hour from the time, being mindful that if this take you into the previous day you will need to adjust the date too.
If you prefer to use Degrees (e.g. 56) and Minutes (e.g. 30), then fill in both boxes respectively. If you prefer to use Decimal Degrees (e.g. 56.5), then just fill in the Degrees box and leave the Minutes box blank.
If your Latitude is South, ensure you enter a negative value for the Latitude degrees.
If the Longitude is West, ensure you enter a negative value for the Longitude degrees.
Once the above values have been entered, click the Calculate button to calculate the position of the sun at that time and location. You can also use the "Adjust time" scroll bar to adjust the time anywhere from 00:00 to 23:59.
Latitude:
°
′
Longitude:
°
′
-- Date in ISO 8601 format yyyy-mm-dd (e.g. 2023-05-13).
: Hours in 24 hour format (0 to 23) and minutes (0-59).
See notes above about British Summer Time.
Sun's Azimuth (Clockwise from 0 degrees North)
Sun's Altitude (Horizon at 0 degrees)
Sun above or below the horizon
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