Solar Tempometer

Calculate your solar time*

Proceed as follows: First look up your longitude. Examples: Paris F: 48n52, 2e20, France New York (US): 40n43, 74w0, New York (US) Los Angeles, CA (US): 34n03, 118w15, California (US) Amsterdam NETH: 52n22, 4e54, Netherlands Bruxelles Be: 52n05, 4e20, Belgium Tokyo, JAPAN: 35n42, 139e46, Japan For New York e.g. must below next be entered at longitude degree 74 and with the minutes 0 ! New York (US) is west (w) of Greenwich. (Attention: use installs a cookie keeping your setting for 14 days) (in case a wrong date/time of 27 Febr. is indicated, which rarely may happen for a disturbance, then please recalculate or reload the page) The time indicated is the predicted position of the sun to which twelve o'clock noon time means that the sun is passing the meridian or in its zenith. The true position of the sun as indicated by a sundial though may deviate with some minutes from this indication that is based upon a formal account of the equation of time. That can be caused by imprecisions in the scale of the sundial in question. Having a standard-time clock at home or a wristwatch thus set to the sun requires, if you want to keep it within a margin of a couple of minutes, that you correct the time about once a week according this tempometer, Not doing this the difference can quickly amount to half an hour (from Nov. 5 to Febr. 5 e.g.). To remind you thereof is the cookie of the Tempometer that keeps your settings, thus set to eight days so that after that period the Tempometer again needs to be set to the longitude. Correcting for the sake of nature can best be done with natural regularity: on Cakra-sundays e.g., see below: To check this by hand you need to consult the pages about the equation of time and the FCO-calendar. For calculating solar time for another date and/or time, go to the java-implementation for it. This is an historical page: it offers, since 10 Nov. 2005, the first running Tempometer on the internet. Nederlandse versie

 
*: Solar Time = GMT corrected for the Equation of Time
- Greenwich Mean Time = the time standard for the entire world.
It is mean local time to the longitude of zero irrespective summertime. 
It is also called UTC (Universal Time Coordinated) or worldtime.
The time on your clock differs from this one
depending your time zone and summertime.
- Equation of Time = the difference the clock makes with a sundial.