Crossword clues for the word: BESSEL The word BESSEL has appeared as an answer to at least 4 crossword clues on different crossword puzzles. Crossword clues for BESSEL Showing 1 to 4 of 4 results Clue(s) Astronomer Friedrich German astronomer who was the first to measure the distance to a star Lunar crater named for an astronomer Prussian astronomer.