<#tomorrowdaylength> tag

krmidas · Post by **krmidas** » Wed 28 Dec 2011 1:22 am

When does Cumulus compute this tag? I would assume at midnight the setting would change, and would stay the same until midnight the next day, but I feel like the value is changing sometime during the day.

-Tom

PaulMy · Post by **PaulMy** » Wed 28 Dec 2011 1:52 am

All webtags and details are listed in the Wiki -

<#tomorrowdaylength> A string giving the difference between the length of day light today and tomorrow. Note. This tag has been shown to generate inaccurate results and will probably be removed from Cumulus but is here for reference only.

Paul

krmidas · Post by **krmidas** » Wed 28 Dec 2011 1:59 am

Thanks for the reminder

but it didn't answer my question.

Post by **steve** » Wed 28 Dec 2011 9:36 am

At start up and then every hour, on the hour.

krmidas · Post by **krmidas** » Thu 29 Dec 2011 6:46 pm

steve wrote:At start up and then every hour, on the hour.

I'm curious, why would it need to be updated hourly? Isn't it just a simple computation based on the following day's sunrise/sunset times?

-Tom

Post by **steve** » Thu 29 Dec 2011 6:57 pm

krmidas wrote:I'm curious, why would it need to be updated hourly? Isn't it just a simple computation based on the following day's sunrise/sunset times?

It doesn't need to. All of the astronomical data is recalculated hourly to allow for things like switching to and from daylight savings time, and to keep the moon phase data current. I suspect that for part of the day, for some time zones, the astronomical data is not quite correct (it gets tomorrow's time(s) instead of today's, perhaps) which would explain why the difference figure changes.

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<#tomorrowdaylength> tag

<#tomorrowdaylength> tag

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