Line of Apsides - main axis of moon’s elliptical orbit
Lunar eclipse - moon is darkened by Earth’s shadow
Major axis - longest axis of an eclipse
Negative shadow - ringed area in path of eclipse
New Moon - Moon faces Earth in darkness
Northern Limit - the northern most part of eclipse
Partial Eclipse - only a portion of moon is covered
Penumbral Eclipse - eclipse when moon partly shadows Earth
Penumbra - secondary shadow partially blocked by light
Perigee - closest point from Earth to moon
Perihelion - closest orbital position to sun
Pinhole Projector - small hole used to project sun
Prominence - magnetic field event when plasma glows
Regression of Nodes - westward motion of moon’s orbit
Revolution - when less mass orbits greater mass
Revolution of Apsides - time for moon to fully orbit
Saros - the repetition of solar, lunar eclipses
Second Contact - time when totality or angularity begins
Shadow Bands - Faint ripples of light across landscape
Shadow Cone - shadow cone of moon or Earth
Sidereal Period - Time moon makes revolution around Earth
Similar Eclipses - Eclipses of a particular saros cycle
Solar Eclipse - when the moon hides the sun
Solar Filter - device to dim the sun’s brightness
Solar Projection - projection of sun on white screen
Southern Limit - southernmost position of solar eclipse
Sunspots - darker, cooler regions of the sun
Synodic Period - time moon completes one cycle phase
Third Contact - moment when totality/annularity is over
Total Eclipse - when moon completely covers sun
Totality - portion of Earth/Moon when completely covered
Umbra - Shadow cone of an astronomical body
