MANILA - A penumbral lunar eclipse will be visible in the Philippines on June 6, the state astronomical agency said on Sunday.

The eclipse begins when the Moon enters penumbra at 1:45 a.m. and ends at 5:04 a.m., PAGASA said.

The astronomical event will also be observed in much of Europe and Asia, Australia, Africa, and other parts of the world.

"A penumbra refers to a partially shaded outer region of a shadow that an object casts. A penumbral eclipse occurs when the moon passes through the faint penumbral portion of the earth’s shadow," PAGASA said.

The agency however warned skywatchers not to expect too much as moon will not be completely shadowed by the darkest part (umbra) of the Earth’s shadow.

"Instead, observers can see only the slightest dimming near the lunar limb closest to the umbra. The eclipse may be undetectable unless at least half of the moon enters the penumbra."