astronomical time


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astronomical time

[‚as·trə′näm·ə·kəl ′tīm]
(astronomy)
Solar time in an astronomical day that begins at noon.
References in periodicals archive ?
All residential outdoor luminaires that are not "high efficacy" must be controlled by a motion sensor and by either a photo-control or astronomical time switch.
And today's start was delayed to let scientists' atomic clocks catch up with astronomical time.
About the only astronomical time period to which the week roughly corresponds is the period occurring between the four major lunar phases; there are approximately seven days from new moon to first quarter moon, from the first quarter moon to full moon, and so on.
Daylight is supplemented with fluorescent lighting systems, controlled by photocell and astronomical time clocks to ensure that the right light levels are established throughout the station at all hours.
Astronomical time clock controls enabled both the incumbent and the new wall packs to shut off when sufficient daylight was available (12 hours, 14 minutes on the day this data sample was taken).
Wright's team's work has proven, for the first time, that the Ruprecht 147 cluster is only a bit younger than the Sun on the astronomical time scale.
Though the disks survive less than 100 million years -- the blink of an eye in astronomical time -- they hold a revolution in the making.
According to Spade, the Softswitch128 system was the best choice for The Victory Bank as it provides the most demanding needs for switched public space lighting, offering occupancy, scheduled and manual control, daylight sensing, astronomical time clock and contact closure inputs for flexibility and energy savings.
ut because the Earth's rotation is irregular and is slowing down by two thousandths of a second per day, this would cause us to drift slowly away from astronomical time.
Both sources are controlled by an astronomical time clock.
Tenders are invited for Repair Replacement Of Manual Switch With Energy Efficient Astronomical Time Switch For Street Light Under Ge(U)Em Meerut Cantt
This means that atomic clocks, which measure the length of a second with extreme accuracy based on reactions in caesium atoms, are ever so slightly out of kilter with astronomical time.

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