• Why is there day and night phenomenon?

    Why is there day and night phenomenon?
    The Earth's sphere is always half bright by the Sun, so it was born day and night, because the Earth rotates around its axis, so every surface of the Earth is illuminated by the
  • Discover methods of measuring time

    Discover methods of measuring time
    The idea of ​​measuring time only appeared about 5,000-6,000 years ago when people began settling down and building civilizations. Before that, time was divided into two concepts,