Evaporative Cooler and Tonnage

Evaporative coolers are very useful in dry and hot climate. Pour a lot of water and run the fan, and get the cool moist breeze. It is a simple device and it is good for what it provides – fresh cool air. For a long time I have been thinking how to compare the evaporativeContinue reading “Evaporative Cooler and Tonnage”

Light Pollution: Can it be reduced

Astronomy is a wonderful field. From History it could be easily seen that Astronomy is the cradle of both Physics and Mathematics. Most of the early phisicists and mathematicians were astronomers too. All astronomical observations from prehistorical times to 1609 were exclusively using naked eye. Those early astronomers had no access to telescopes or camerasContinue reading “Light Pollution: Can it be reduced”