20211223 : tropics
Now, this is not new information. It is just new to me. Why am I writing about it? Because I am happy I found out something which I had taken for granted all along. Besides, I am bored and nothing else to do... All my life, I have known that we in Bangalore have "tropical" weather. I know it is so because it lies between the two lines (tropic of Capricorn and tropic of Cancer). I had never stopped to ask why the 2 arbitrary lines are there. Surely a km this side or that wouldn't make a big difference to the weather... And it doesn't. They have nothing to do with the weather. The weather is just a consequence of being there.. If we take a long and narrow pole and erect it perfectly vertical, it will form a shadow based on the time of the day (where the sun is) At 12 noon, the sun is directly overhead and there is no shadow. That is what my textbooks said. The truth is there will still be a shadow depending on the time of the year (tilt of the earth). That shadow at 1