Photoperiod Calculator (author: J. Lammi © 1996-1999) V 0.66 Last modified Tuesday January 26 21:41:13 EET 1999 Scout Report for Science and Engineering Selection
This site has been chosen as a selection for the Scout Report for Science and Engineering (October 15, 1997), the premier bi-weekly collection of useful Internet sites for discerning Internauts in life science and engineering.

The home of this is URL: http://www.netti.fi/~jjlammi/sun.html

help
Select for dates
Use the current date
Input a date value		 Select for locations
Use the menu for a city
Input a latitude value		 Daylight savings time
Set this option ON/OFF

Month

Day

Location

Latitude

N S

Longitude

W E

Timezone
Daylength is now hours
Sun is rising hours
setting down hours
Height angle at noon is degrees.
Declination of sun is degrees.
Local time is UTC + + daylight savings time
Date , the day of the year
Latitude of is degrees
longitude degrees


Contact: jjlammi@netti.fi

Instructions

Either pick up a city of the menu or input your own location with a latitude and a longitude in decimal degree units and a time zone in hours.
Check the button S for the latitudes of the southern hemisphere.
Check the button W for the longitudes of the western hemisphere.

A timezone deviating by more than two hours in respect to the value assumed on the base of the given longitude will be rejected.
Use a decimalpoint for degrees input instead of a colon separator. An invalid argument value will cause a JavaScript-errormessage like "xx is not a number".