General Science of the Day
What is sunshine duration and solar radiation? (Meteorological Instruments)

Sunshine duration means the length of time during which a specific area is physically exposed to solar radiation. Solar radiation is defined as the total incoming solar energy of direct, scattered, and reflected electromagnetic radiation, ranging from near ultraviolet to near infrared (300 - 4000 nm) in wavelength, emitted by the sun.

Report on Sunspot Observations
General Info of the Day
Date 2018-04-21
Moon Phase of the Day
Astronomy phenomenon
Sunrise and Sunset, Moonrise and Moonset