Why do both the Tropics and Temperates remain undiscovered and re-undiscovered? The Tropics and the Temperates remain undiscovered and re-undiscovered, because both uses of Ethiopian calendar months only in the current Ethiopia and Gregorian calendar months in the Tropics are false and against the solar system. Use of Ethiopian calendar only in the current Ethiopia is false and against the solar system, because the circumference of current Ethiopia cannot cover 24 hours (half part of Ethiopia is day and other half part is night cannot happen).Figure 5 shows one day is for the Earth which has 12 hours daylight and 12 hours night at the equator and long, longer and longest daylight hours in zone 3,2 and 1, when short, shorter and the shortest daylight hours recur in zone 4,5 and 6 respectively. This day is the day when the sun is overhead on the Tropic of Cancer. The day is called Sene 14 in the Tropics, when it is called June 21 in the Temperates. Nevertheless, shorter variation of day and night, faster rotation and moderate seasons of the Tropics are revealed by the Ethiopian calendar months. Therefore any one is able to assert one who does use Ethiopian calendar only in the current Ethiopia is he/she does know neither daylight nor night of the day. Use of Gregorian calendar in the Tropics is false and against the solar system because longer variation of day and night, slower rotation and extreme seasons of the Temperates which are revealed by the Gregorian calendar month’s were/are/will not be recurring in the Tropics. Thus any one is able to assert that one who does use Gregorian calendar in the Tropics is neither his or her body nor soul is connected with where he/she stands on.