If you like taking beautiful cool night photos you may find BluHour.com useful. As stated on Wikipedia:
The blue hour comes from a French expression (l’heure bleue), which refers to twilight, the period each morning and evening where there is neither full daylight nor complete darkness.
BluHour is a website that simply helps photographers estimate the best time frame for taking blue hour photos at any selected location so they know when they need to be there.
To use the site simply type in the location where you want to take your photos and get back blue hour start and end times.
- Tells you when you can take cool night photos.
- Simple and easy to use.
- No registration.
Check out BluHour @ www.bluhour.com