LEXINGTON, Ky. (WKYT) - Thursday is the longest day of the year. At 4:50 pm, the Northern Hemisphere reaches it’s maximum tilt towards the Sun meaning Thursday, the Sun reached it’s highest point in the sky all year. In Lexington, the Sun will be in the sky for 14 hours and 48 minutes. This year though, summer is coming 18 hours earlier than last year. Why? It has to do with our calendar adjustments.