Exercise 5: Tides.

This figure shows again the tide that results from the combined movement of earth, moon and sun but this time with the assumption that the form factor at your home location has the value 24. Note again how the tidal range changes with time: It is again particularly large at days 0 and 15 and particularly small at days 7 and 22, so the spring-neap cycle is not changed. What has changed is the number of high tides per day: A large form factor means a diurnal tide. You can verify this by counting the number of high tides between successive neap tides; between days 7 and 22 you should now count only 14 high waters. A few places on earth have tides resembling this figure closely.