NEED TO KNOW

The terms and sym­bols used in The Sky Guide

Sky at Night Magazine - - DECEMBER HIGHLIGHTS -

Universal time (UT) and Bri­tish Sum­mer Time (BST) Universal Time (UT) is the stan­dard time used by astronomer­s around the world. Bri­tish Sum­mer Time (BST) is one hour ahead of UT

RA (Right as­cen­sion) and dec. (dec­li­na­tion) These co­or­di­nates are the night sky’s equiv­a­lent of lon­gi­tude and lat­i­tude, de­scrib­ing where an ob­ject is on the ce­les­tial ‘globe’

Fam­ily friendly Ob­jects marked with this icon are per­fect for show­ing to chil­dren

Naked eye Al­low 20 min­utes for your eyes to be­come dark-adapted

Photo opp

Use a CCD, plan­e­tary camera or stan­dard DSLR

Binoc­u­lars

10x50 rec­om­mended

Small/ medium scope Re­flec­tor/SCT un­der 6 inches, re­frac­tor un­der 4 inches

Large scope Re­flec­tor/SCT over 6 inches, re­frac­tor over 4 inches

GET­TING STARTED IN ASTRON­OMY

If you’re new to astron­omy, you’ll find two es­sen­tial reads on our web­site. Visit http://bit. ly/10_ea­sy­lessons for our 10-step guide to get­ting started and http://bit.ly/ buy_s­cope for ad­vice on choos­ing a scope

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