The region of partial illumination surrounding the darkest part of a shadow caused by an eclipse

The point in the orbit of a moon or a satellite, at which it is nearest to the Earth

Illustration: perigee ‘Supermoon’ versus an apogee ‘Minimoon’

A technique for measuring the brightness of celestial objects

Spherical ball of material such as rock and/or gas that orbits a star. The Earth is a planet.

An expanding shell of glowing gas expelled by a star late in its life. Our Sun will create a planetary nebula at the end of its life

ספק חשמל/כוח. * הטלסקופים הממונעים מגיעים ללא ספק חשמלי. ניתן לרכוש מתאם רלוונטי ומיוצב, דרך חנות הטלסקופים של מצפה הכוכבים ברקת.

The apparent motion of a star across the sky (wihtout the star’s parallax), arising from the star’s velocity through space with respect to the Sun