1) Meteor shower 
The Ursids (URS) meteor activity begins annually around December 17 and runs for a week plus, until the 25th or 26th. This meteor shower is named for its radiant point which is located near the star Beta Ursae Minoris (Kochab) in the constellation Ursa Minor. == History == The Ursids were probably discovered by William F. Denning who observed them...
Meteor shower. Most active day is Dec.22. Weak shower.
a collection of meteors comprising a meteor shower visible around December 22 and having its apparent origin in the constellation Ursa Major.