Lunar calendar or crescent moons and others employing detailed calculations. Since each lunation is approximately days (29 days, 12 hours, 44 minutes, 3 seconds, or days), it is common for the months of a lunar calendar to alternate between 29 and 30 days. Since the period of twelve such lunations, a lunar year, is only 354 days, 8 hours, 48 minutes, 34 seconds ( days), purely lunar calendars lose around 11 days per year relative to the Gregorian calendar. In purely lunar calendars like the Islamic calendar, the lack of intercalation causes the lunar months to cycle through all the seasons of
Riverside Beaver County School District and administrators with an average teacher salary of $57,898 and a top salary of $112,815. The work year is 186 days with 180 student instruction days. Teachers work 7 hours 45 minutes with a 30-minute duty-free lunch and a daily preparation period. Teachers receive extra pay for extra required work like updating curriculum. Additionally, the teachers receive a defined benefit pension, health insurance, professional development reimbursement, 3 paid personal days, 10 paid sick days (which accumulate) vision insurance, dental insurance and many other benefits. Guidance counselors receive extra $400 pay plus extra summer pay. In 2011, the average teacher salary