The thymus is positioned in the upper chest cavity above the heart. Thymus. The thymus gland is the main organ of the lymphatic system. Located in the upper chest region, the primary function of this gland is to promote the development of specific cells of the immune system called T lymphocytes. T lymphocytes or T-cells are white blood cells that protect against foreign organisms (bacteria and viruses) that have managed to infect body cells.
How long does it take for the Earth to rotate on its own axis ? The time it takes the Earth to rotate once is called a day (24 hours). The actual rotation time is a little less, about 23 hours and 56 minutes. Why do we have Day and Night?
It takes Earth 23 hours, 56 minutes and 4.091 seconds to completely rotate on its axis compared to the background stars. This amount of time is known as a sidereal... It takes Earth 23 hours, 56 minutes and 4.091 seconds to completely rotate on its axis compared to the background stars. This amount of time is known as a sidereal day. Earth rotates from west to east, which is why the Sun rises in the east and sets in the west. Earth's rotation is also slowing slightly with time, meaning that days were shorter in the past. This is due to the effect of the Moon on Earth's rotation. Atomic clocks show that a day is now about 1.7 milliseconds longer than it was a century ago.