General Science of the Day
What is barometric pressure? (Meteorological Instruments)

Barometric pressure is the pressure in the static atmosphere.
On the Earth's surface, barometric pressure is the weight of the vertical air column per unit area and is also the force per unit area (P=f/A) exerted by the vertical air column. Measurement of the barometric pressure began in 1643, when Italian scientist Evangelista Torricelli who believed that air had weight first took a measure of it, and he therefore invented the first mercury barometer.

Report on Sunspot Observations
General Info of the Day
Date 2017-01-20
Moon Phase of the Day
Astronomy phenomenon Last Quarter﹔Comet P/Spacewatch (2013 YG46) Perihelion
Sunrise and Sunset, Moonrise and Moonset