Formula · Our own model

True solar time (hour and, across midnight, the date)

Longitude offset plus the equation of time. A correction usually moves only the hour pillar; if it crosses midnight (up to about two hours in the far west) the date moves back with it and the day pillar changes. This is the only correction applied, so nothing is converted twice.

Stored as clock time plus longitude, converted on the fly

What kind of formula this is

Our own model

This one is our own model: the formula and its inputs are shown on the page.

Related: Chart tool · all formulas · tools

FAQ

Where is this formula used?

It is the same entry listed on the method page, used in pages such as Chart tool; the link above shows it in context.

Did you invent this formula?

This one is our own model: the formula and its inputs are shown on the page.

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