[Avodah] kiddush levana

[Eli Turkel]

>I understood that some claim that it is not mitzvat aseh she-hazman
>grama. The argument is that one can say the bracha only when the moon
>is increasing in size and that happens only in the first half of the
>month. But it is not intrinsically connected to time in the same sense
>that shofar or lulav are connected.

My claim , from memory, was based on R. Shlomo Kluger in Chochmat Shlomo 426,
see however elef lecha shlomo 193 where he differentiates between the
beginning and end of the bracha
RMF also holds that it is a mitzvat aseh she-hazman grama (CM2 15-2)
disagreeing with the idea of R. Shlomo Kluger
and stating that the reason why a mitzva is not always done is irrelevant
It is discussed in detail by Minchat Asher and the sefer Ishei Yisrael

Note that Turei Even holds that bringing bikkurim is not mitzvat aseh
she-hazman grama
even though one cant bring it after chanuka. Similarly the Ramban says
that sefirat ha-omer is
not a mitzvat aseh sheha-zman grama and R. Frank in Har Tzvi says that
birjkhat ha-ilanot is also
not a mitzvat aseh she-ha-zman grama

Bottom line not everything that has some time element is necessarily
mitzvat aseh she-ha-zman grama

-- 
Eli Turkel