Online-Photoperiod Calculator V 1.94 L   Author: J. Lammi  ( 1996 - 2015)

Computation of Daylengths, Sunrise/Sunset Times, Twilight and Local Noon

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Select for dates
Use the current date
Input a date value
Select for locations
Use menu of cities
Input latitude & longitude
Daylight savings

Calculation Date
Month   Day
Latitude N S   Find latitudes
Longitude W E   Find longitudes
Local time h min TZ Find timezones
Temperature oC Refraction

This is the fail-safe version which has no cookies to restore your location parameters while loading.
To change the location parameters, do edit the JavaScript function GetLastVisit()

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On the Factors affecting Computation Accuracy
Last modified on July 7, 2015