Astronomy Picture of the Day . ... Credit Copyright: Stefan Seip ( TWAN ) Explanation: Stark shadows of mountains and crater walls stand out along the lunar terminator, or shadow line between night and day, in this telescopic image. ... Streaming through a gap in the eastern wall of 45 kilometer wide Hesiodus crater , the low-angle sunlight produces a long sunrise ray playing along the otherwise shadowed crater floor. ... Publications with keywords: crater - sunrise - terminator - shadow . ...