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Tweet one of the hashtags #meteorwatch, #bbcstargazing, your postcode, your country and, optionally, the meteor count - (you can use country codes such as UK or US).

Here are some examples of valid tweets:

#bbcstargazing E15 uk
#bbcstargazing SW5 0TR uk 1
#bbcstargazing 55210 us 4
#meteorwatch 34013 ita 10
#bbcstargazing sydney australia 32
#meteorwatch paris france
#meteorwatch berkley CA
#bbcstargazing 3011 ch 8

The list of three letter country codes (ISO 3166-1 alpha-3 codes) can be found here