TpSol - your solar time

145 reviews
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About this app

The main function of TpSol is to give the solar time according to the legal time and the GPS location, but TpSol makes much more:
- It supplies the equation of time and the solar declination
- It indicates the azimuth and the altitude of the Sun
- It draws the shadow of the Sun on a sundial
The sundial can be drawn according to the orientation of the smartphone or the tablet. In this case, TpSol uses a magnetic sensor that it is necessary to calibrate in this way:
- Be sure that no metallic object or magnet is in the surrounding of the device (think to the magnetic lock of the smartphone protection)
- Activate the dynamic drawing of the sundial (button 'Auto' of the group 'Towards')
- Turn slowly the smartphone or the tablet on the three axes: 2 to 3 revolutions during about 10 seconds per axis.
The calibration is finish. The parameters of the sundial orientation (inclination and declination), which are computed and supplied by TpSol from the magnetic sensor, are then less erratic and more accurate. However, the accuracy is not better than some degrees.
Updated on
Sep 9, 2015

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Ratings and reviews

132 reviews
Allan Cady
September 9, 2022
Does what it does well, but one thing puzzles me. The graphic is mirror image from a physical sundial here (west coast U.S.). Actual sundial has morning shadow and numbers on the west side of the dial (left if facing north), evening on the east, and the tip of the shadow rotates clockwise. This app, with noon pointed up/north, shows morning shadow on the right, evening on the left, and the shadow rotates anti-clockwise. All the numbers look correct. Is this intentional? If so, why? Thanks.
2 people found this review helpful
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Joe Riehl
February 9, 2023
Wonderful to have solar time, without all the calculations. A great addition would be a notification at true solar noon, or other times.
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A Google user
January 27, 2019
Useless as a daily watch. gps is not working and manual location resets after closing the app.
5 people found this review helpful
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What's new

Bug correction concerning date/time modification