Answer:

umbra

Answer	Crossword Clue
UMBRA	Eclipse shadow
UMBRA	A parasol provides it
UMBRA	Place to see a total eclipse

UMBRA	Darkest region of a sunspot
UMBRA	Eclipse-viewing spot
UMBRA	Shadow
UMBRA	Astronomical shadow
UMBRA	Planetary shadow
UMBRA	Eclipse phenomenon
UMBRA	Sunspot center
UMBRA	Shaded area

UMBRA	Shadowy apparition
UMBRA	Dark area
UMBRA	Shaded region
UMBRA	Eclipse feature
UMBRA	Shade
UMBRA	Shadow.
UMBRA	Astronomer's shadow.
UMBRA	Shaded area.

UMBRA	Vestige or fish
UMBRA	Spectral image
UMBRA	Dark area in an eclipse
UMBRA	Blackest part of a shadow
UMBRA	Planet's shadow
UMBRA	Celestial shadow
UMBRA	Dark spot
UMBRA	Total eclipse setting

UMBRA	Shadow during an eclipse
UMBRA	Darkest part of a shadow

Crossword

a puzzle consisting of a grid of squares and blanks into which words crossing vertically and horizontally are written according to clues.