Below you can find the In 1843 heinrich schwabe noted that the number of these varies in a periodic cycle Jeopardy Words Answer. The answer to In 1843 heinrich schwabe noted that the number of these varies in a periodic cycle has 8 letters. This clue belongs to the Here comes the sun category and is part of Jeopardy Word Level 1111. If you scroll near the bottom you will find other clues and answers part of level 1111