Amateur astronomers and scientists have been wondering what Comet C/2011 L4 (Pan-STARRS) would be like for almost two years. Having made its closest approach to the Sun today (Sunday March 10th), it is now being brilliantly illuminated - and is a prime target for northern hemisphere observers.

The best time to look is about 30 to 45 minutes after sunset. This narrow window of viewing time is when twilight fades enough for the comet to show through at least a bit, but before it sinks too low and sets.

Read more info here.