This is great for making friends' jaws drop as you show off your iPad: simply point the device at the night-time sky, and it identifies stars, constellations and satellites.

It strives to identify the categories and constellations that block movement from occurring.

Luís Henríquez, a survivor from the Chacabuco concentration camp, describes how a group of about 20, lead by a Doctor Alvarez (who was knowledgeable in astronomy), was taught theory during the day and learned how to identify constellations at night.

There are no markings on the night sky, though there exist many sky maps to aid stargazers in identifying constellations and other celestial objects.

The second proved difficult to work with, as the small windows of the Mercury capsule gave a very limited field of view, making it hard to identify constellations.

The experience was enthralling: under the tutelage of James Barrow, I examined Saturn's rings, identified constellations (Orion taking aim at Taurus) and watched meteors blaze across the sky.

When Katy and Kit were small we would identify constellations and christen patterns of our own.

This evening I plan to take Serena out under the night sky and identify constellations.

"TEDDY'S QUEST," a Sky Show about a bear who was born in space and sets out to find a friend; with information on how stars are formed, how to identify constellations and what it's like on the moon.

You can identify famous constellations like the big dipper and also other planets like Saturn.