lunar eclipse can only occur at the phase of full moon.
when the earth blocks sunlight it produces a shadow with two regions the umbra and th penumbra.
the earth's shadow will covrr the moon's surface and causes a lunar eclipse.
lunar eclipse can be observed with the naked eye.
it can only be observed by people on the side of the earth which is having night-time.
when the earth is between the sun and the moon and the three o them lie in a straight line sunlight cannot pass through the earth because it is an opaque object.
as sunlight travels in straight lines it cannot bend around the earth.
therefore the earth blocks the sunlight from reaching the moon.
lunar eclipse occurs when the earth is between the sun and the moon and the three of them lie in a staight line. tha bove diagram shows the positios of th moon earth and sun during the eclipse of the moon