There the captain fixed his position and used a chronometer to calculate his longitude, which he double-checked against his previous observations of hour angles.
Sir, he answered me, I have chronometers variously set to the meridians of Paris, Greenwich, and Washington, D.C. But in your honor, I'll use the one for Paris.
" My watch? A family watch, monsieur, which has come down from my great–grandfather! It doesn't vary five minutes in the year. It's a perfect chronometer, look you" .