Unit of time

years ago Solar year Great Year annum lunar day second 1/3600 of a second Adar Aleph fourth-month period indiction svedberg K'atun cosmological decade high season quarter Prophetic Year femtosecond sidereal day half hour tropical year academic quarter leap year work week Planck time Julian year olympiad academic term sidereal year week common year tierce Synodic day K'in hour half year galactic year Gaussian year synodic month light-foot decade decade fortnight ke trimester season millennium quarter of an hour picosecond semester Gregorian year