Salaam
Quran was revealed one shot in one night.
Leylatou el qadr (97-1) is night of measure. (qadr is used also here 73-20 ;54-49).
So we can understand it as night of perfect measure for example between the length of day and length of night. It is an equinox day.
but quran was revealed also in shahr ramadhan (2-185) : According to brother ayman Shahr means Full moon
According to brother pazuzu, ramadhan is period of first rains in autumn
والرَّمَضِيُّ من السحاب والمطر: ما كان في آخر القَيْظِ وأَوّلِ الخَرِيف، فالسحابُ رَمَضِيٌّ والمطر رَمَضِيٌّ، وإِنما سمي رَمَضِيّاً لأِنه يدرك سُخونة الشمس وحرّها.
والرَّمَضُ المطر يأْتي قُبُلَ الخريف فيجد الأَرض حارّة محترقة.
combining all together , we find that quran was revealed in a night combining full moon night an autum equinox
we can also notice that firsts verses of each surate is generally speaking about revelation.
30-2 and 30-3 give us the year of revelation.
history tell us that 617 is the year of apogee of roman defeat against persians. Heraclius then organized and won against persian during next years. It is what Quran predicted in that verses.
http://en.wikipedia.org/wiki/Byzantine-Sassanid_War_of_602-628the amazing fact is that 20 september 617 is a very special night astronomically.
it is an autum equinox day ( an 19 :00 approximativally)
at the same time it was a full moon night
but also, in that night, moon was at his perige. That mean that moon was very big in the sky.
Full moon + perigee is called supermoon
supermoon in an equinox day and it is very rare.
you can verify this here
http://www.fourmilab.ch/earthview/pacalc.htmlbut there is another interesting phenomenon.
the night of the next full moon after that supermoon there was a lunar eclipse (inchaqqa al qamaru ?).
here eclipse during the night between 19 and 20 october 617

please notice that 37-1 (saff'atou saffan) can be a description of alignment of moon, earth and sun during eclipse or full moon.
other first verses of sourate speaks about stars .
Perhaps something else happened in the sky in that period.
source: french article here
http://nawaat.org/portail/2012/12/23/ibadat-el-chouyoukhs-8-polygamie-et-esclavage-chez-les-islamisto-paiens/Peace