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The Silence Tally Mark Day is an annual observance that takes place on 23 April, celebrated by Whovians worldwide. It marks the first appearance of the alien race The Silence on British television series Doctor Who.

Origins
The Impossible Astronaut is the first episode of the sixth series of the revived Doctor Who. It aired on 23 April 2011 and was the first time viewers were introduced to The Silence.

It is not clear which Whovian first raised the idea, but the date has been posted and shared countless times on social media, mainly Tumblr and Facebook.

Celebration
On this day, Whovians draw tally marks on themselves. Characters in Doctor Who have been known to do this when in the presence of The Silence, namely The Eleventh Doctor, River Song (Doctor Who), Amy Pond and Rory Williams. Whovians then go about their daily activities as per normal, often scaring friends, family and strangers who are not in the know.

Variations
Although markers appear to have been used in the show, Whovians have been known to use other means of marking like pens, paint and even mascara.

Some Whovians draw one or two on their hands while others go all out, marking their necks and faces.