Loi Krathong coincides with the Lanna (northern Thai) festival known as "Yi Peng" (Thai: ยี่เป็ง). Due to a difference between the old Lanna calendar and the Thai calendar, Yi Peng is held on a full moon of the 2nd month of the Lanna calendar ("Yi" meaning "2nd" and "Peng" meaning "month" in the Lanna language). A multitude of Lanna-style sky lanterns (khom loi (Thai: โคมลอย), literally: "floating lanterns") are launched into the air where they resemble large flocks of giant fluorescent jellyfish gracefully floating by through the sky
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