Description
Solar time (as shown by a sundial) is not standard time (as shown by your watch). To find out why, click here.
Move the slider to today’s date. Read the height of the bold curve on the slider (for example, 1h10) and add this value to the time shown on the sundial: that’s standard time!
Conversely, the Papophoplon gives you solar time: subtract the adjustment from the time on your watch—that’s solar time!
Its simplicity and effectiveness were recognized with a silver medal at the 2026 Concours Lépine International in Paris!
This model is calculated for the longitude of Paris. Plus, on the back, you’ll find the additional adjustment to apply for any location in metropolitan France!