Well no, Tom,

This tag gives "the lighting" of the moon: 100% = full moon, 0% = new moon.
So it goes from 0% to 0% (new moon) via 100% (full moon). It does not indicate the age of the moon, since we do not know where we come from and to what we are going.
I had the same idea: "#set $md = int (($almanac.moon_fullness / 3.45) +.5)"

PS: What is the difference between "$almanac.moon_fullness" and "$almanac.moon.moon_fullness"?

An other idea ?

thank you,

Pascal


Le 30-03-21 à 11:05, Tom Keffer a écrit :
Could you use

    #set $days=$almanac.moon.moon_fullness * .2953
    <p>The moon is $days days old.</p>

.2953 is the length of the lunar cycle, divided by 100.

On Tue, Mar 30, 2021 at 1:41 AM P C <[email protected] <mailto:[email protected]>> wrote:


    Hello, again me ;)

    I am looking for the tag of the age of the moon (in days) that
    goes from New Moon in New Moon in 29 days. This means that the
    full moon is between the 14th and the 15th day.

    NB: Pyephem is installed

    Thank you !
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