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'''Heart Day''' is an ancient [[Terran]] custom , that is celebrated by the [[Imperium]] and the [[Adeptus Mechanicus]] as well.{{Fn|1}}

According to [[Imperial]] historical records show that , it was a mysterious festival, where [[Terran]] citizens signaled their compatibility by displaying gifts fashioned after the hearts of powerful foes they had presumably defeated. In modern times, Heart Day is celebrated within the [[Astra Militarum]] by allowing [[Guardsmen]] handing to hand out motivational cards, that represent their willingness to fight and die alongside each other.{{Fn|1}}