Solar System
Sun · Earth · Moon
New Moon · 0% lit
today past new moon
Bright limb Direction toward the Moon's lit edge, measured from celestial north going east. 0° = north, 90° = east.285°
Parallactic At the Moon's spot on the sky, the angle between celestial north and your local zenith. Changes as the Moon rises, transits, and sets.47°
Tilt How much the bright limb tips away from straight-up in your sky. This is what makes the same Moon look 'rightside up' in Boston and 'upside down' in Sydney at the same moment.-122°
Moon alt Angle above your horizon. 0° = on horizon, 90° = directly overhead (zenith).39°
Observer:
42.36°N 71.06°W