PSY397H1 Lecture Notes - Lunar Phase, Photoperiodism, Solar Time
Document Summary
Psy397 chapter 3 two groups of clocks: physical clocks, biological clocks. Our clocks focus on the solar day. Provides t8ime cues through photoperiodism: caused by earthly movements. A fixed tilt of 23. 5 degrees and the elliptical pattern of rotation account for the seasons. The month tidal rythms are controlled by the moon: revolves around the earth every 27. 25 days (sidereal month) Due to the rotation of the earth around the sun the duration from one moon phase to the next is about 29. 5 days (lunar month) The month and year first measured time with emergence and disappearance of sun, moon and stars. Menstrual cycle is the almost the same as moon: provided measure for pregnancy. Yet 12 moons is not a year: not using the moon the egyptians estimated the year to 365 days. Based predictions on seasonal flooding of the nile and the appearance of sirius in the canis major.
