New moon western horizon shortly after sunset and before moonset. A lunation or synodic month is the average time from one new moon to the next. In the J2000.0 epoch, the average length of a lunation is 29.530588 days (or 29 days, 12 hours, 44 minutes, and 2.8 seconds). However, the length of any one synodic month can vary from 29.26 to 29.80 days due to the perturbing effects of the Sun's gravity on the Moon's eccentric orbit. In a lunar calendar, each month corresponds to a lunation. Each lunar cycle can be assigned a unique lunation number to identify it. The
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