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2. Atmos clock - Wikipedia

   en.wikipedia.org/wiki/Atmos_clock

   A temperature variation of only one degree in the range between 15 °C (59 °F) and 30 °C (86 °F), or a pressure variation of 3 mmHg, was calculated to provide energy for two days' operation for an early prototype, [3] while for a more recent Atmos 540 model the corresponding value has been computed as 4.3 days per °C.

3. WWVB - Wikipedia

   en.wikipedia.org/wiki/WWVB

   This time scale is the calculated average time of an ensemble of master clocks, themselves calibrated by the NIST-F1 and NIST-F2 cesium fountain atomic clocks. [ 4 ] In 2011, NIST estimated the number of radio clocks and wristwatches equipped with a WWVB receiver at over 50 million.

4. List of atomic clocks - Wikipedia

   en.wikipedia.org/wiki/List_of_atomic_clocks

   Operation date Type Accuracy Location ... 18 cesium atomic clocks and 4 hydrogen maser clocks ... DOST-PAGASA Juan Time [27]

5. This Alarm Clock Shows You the Date, Time and Temperature ...

   www.aol.com/entertainment/alarm-clock-shows-date...

   Plus, this device comes with a USB charging port, as well as a temperature and date display! This top-rated alarm clock from Walmart is currently on sale, and it’s seriously a steal. For only ...

6. Atomic clock - Wikipedia

   en.wikipedia.org/wiki/Atomic_clock

   Atomic clocks are installed at sites of time signal radio transmitters. [103] They are used at some long-wave and medium-wave broadcasting stations to deliver a very precise carrier frequency. [104] Atomic clocks are used in many scientific disciplines, such as for long-baseline interferometry in radio astronomy. [105]

7. Chip-scale atomic clock - Wikipedia

   en.wikipedia.org/wiki/Chip-scale_atomic_clock

   Commercial manufacturing of these atomic clocks began in 2011. [4] The CSAC, the world's smallest atomic clock, is 4 x 3.5 x 1 cm (1.5 x 1.4 x 0.4 inches) in size, weighs 35 grams, consumes only 115 mW of power, and can keep time to within 100 microseconds per day after several years of operation.