Here’s a horological related one. A one clue rebus should be all that is necessary. Answer with a picture.
Here’s a horologically related one. Well, your line of thinking is pointing in the right direction, but no star for your answer, I’m afraid!
And I thought this would be so self evident that there would be a reply within minutes! What does the globe depict? Decide that, and the answer will hit you between the eyes,
Longitude. Also the story of John Harrison and his efforts to perfect the marine chronometer. PS: Just saw the rest of the requirements.