OCR Text |
Show Basis of Time Reckoning. The basis of reckoning standard time at the United Status Naval observatory ob-servatory ta transit observation of the Stars. The observatory has three standard clocks running In a constant temperature vault, electrically wound and aealed to keep the air pressure constant. Meridian circle observations observa-tions of selected stars are taken regularly reg-ularly on clear nights, and from these observations the errors of the standard stand-ard clocks are determined and corrected. |