Zenith Value

[spyrou]

I have met at least 2 elxis modules (event calendar & greek calendar) with the parameter "Zenith" below "Latitude" and "Longitude" and I must input a value for my location in it. Does anyone knowing where can I find this value for my location. I have searched the internet via google unsuccessfully. Any help???

[datahell]

On google maps: http://maps.google.com
Locate the exact spot you are interested in and copy the link google provides you for that spot. There is an "ll" parameter, this is the latidute and longtitude.

[webgift]

For example Rhodes :
http://maps.google.com/maps?f=d&source=s_d&saddr=36.16227,27.976685&daddr=&hl=en&geocode=&mra=dme&mrsp=0&sz=11&sll=36.335041,28.119507&sspn=0.430893,0.891953&ie=UTF8&z=11

Has a parameter named 'sll'. sll=36.335041,28.119507. Do you mean that parameters John ?

[spyrou]

Take a look at the image attachment. Module ask me to "Set a zenith value for my location", I have already setting Latitude and Longitude for my location "Rhodes". 

[attachment deleted by admin]

[spyrou]

Stavro maybe the last parameter "z=11" in the link that you have send me is the "zenith" value for my location. I will try it... Thank you all guys!!!

[datahell]

I guess it asks for zenith value in order to calculate the sun's sunrize and sunset times. You can contact the author of the module (user nikos) to tell you the right value for Greece.

Edit: z=11 is wrong. This is the map's zoom level! it seems zenith is about 90 + 50/60 (degrees) = 90.58333.
I calculated the sunrise time for Athens with this value and the result is correct, so this must be the zenith.

Calculate sun's sunrise and sunset times for Athens, Greece:

Code: [Select]

$ts = time();
$z = 90.58333; //or $z = ini_get("date.sunrise_zenith");
$lat = 37.979116;
$lon = 23.717766;
$time1 = date_sunrise($ts, SUNFUNCS_RET_STRING, $lat, $lon, $z, 3);
$time2 = date_sunset($ts, SUNFUNCS_RET_STRING, $lat, $lon, $z, 3);
Result for April 04 2011: 07:05 and 19:50 (correct!)

[spyrou]

Thank you very match datahell !!! I will find it, for my location Rhodes.

[spyrou]

Where did you found the value for Athens 90.58333

[datahell]

From PHP manual: http://php.net/manual/en/function.date-sunrise.php (see the second comment)

[nikos]

Spyrou have a look here http://en.wikipedia.org/wiki/Zenith until to update the module as i told you by e-mail.

[spyrou]

Thank you datahell, thank you nikos about the info links...

[nikos]

I found for you all you need exactly

1. Here you can find Lat and Lon (Latitude, Longitude) of any place on earth

2. Then you go here where you give values and you can calculate automaticly the rest,  included zenith