As per Jim said:  use all you can to stop any vibrations spoiling the shot.  The timer delay should work just as well as a remote as long as you are gentle on the shutter so as not to disturb the camera. 

I remember the exposure as a reciprocal of the ISO speed used. This works at F11 which is the point of optimum sharpness for most dslr cameras.

eg:     ISO 100 , 1/100th , F11.  

Atmospheric conditions can and will alter the exposure, the above is a good starting point for a clear night.

Events like last nights eclipse call for a totally different exposure - the image in my gallery was ISO 100,  2 secs , F8.  This was found by experimentation - altering exposure until I got a result I was happy with.

If you shoot the images in Jpeg set the white balance to daylight, if shooting RAW don't worry, do it in the RAW converter. This is particularly important if you are capturing events like the harvest moon etc and want to show the true colours.
 
Apart from that all you need is Jim's long lens or you will have to severely crop the image.  Mine is a cropped image. 

And every one said, 'If we only live,
We too will go to sea in a Sieve,---
To the hills of the Chankly Bore!'
Far and few, far and few, Are the lands where the Jumblies live;
Their heads are green, and their hands are blue, And they went to sea in a Sieve.

Edward Lear
http://www.nonsenselit.org/Lear/ns/jumblies.html