The total (total eclipse ) or partial (partial eclipse ) obscuring of light from a celestial body as it passes behind or through the shadow of another body. A lunar eclipse occurs when the sun, earth, and moon are in a straight line and the shadow of the earth falls on the moon. A solar eclipse occurs when the shadow of the moon falls on the earth. See illustrations.
Solar and lunar eclipses
Moon's shadow in solar eclipse
- Wigner energy
- Wigner nuclides
- Wigner's friend
- Wilson cloud chamber
- Wilson, Charles Thomson Rees
- WIMP
- Wimshurst machine
- wind power
- window
- wino
- Wollaston prism
- Wood's metal
- woofer
- word
- work
- work function
- work hardening
- world line
- World Wide Web
- wormhole
- wrought iron
- WS model
- X-ray astronomy
- X-ray crystallography
- X-ray diffraction