香港天文論壇

正呀
興隆d相陸續出籠喇~

what is the sensitivity of those camera??
as thay are moving so fast

There are a website which teach you how to find out the L1,L2 and L3.
http://hypertextbook.com/physics/mechan ... chanics-1/

my fd find this

wah~你車乜野??

6吋
+oil ar

hehe
由於我係個fd d算草度計L1
所以d steps唔係我度
大概係sun's attraction-earth's attraction個period=earth's period(in term of mass of sun and mass of earth)

Philip Chung話L4,L5好stable
但係其他會俾其他野攝走位
要用fuel推返正

睇返wah俾個url
L3真係唔係地球軌道
因為有sun+earth attraction

唔知做乜
計個時出左個r^3
跟住就唔識計
好似有d問題

filter+telescope+adapter+dc

best wish to you

我都有隻ccd閉路
不過行av
仲要12volt電
幾大隻下
唔知有無得改

我上年....唉
夏令,想走lunch都無得我走
去到na都兩點幾
一陣就起曬雲

金星個日點睇好
sun filter定h-alpha?

用你影既相???

really like la

so wide wor