What does first light mean?
Definitions for first light
first light
This dictionary definitions page includes all the possible meanings, example usage and translations of the word first light.
Princeton's WordNet
dawn, dawning, morning, aurora, first light, daybreak, break of day, break of the day, dayspring, sunrise, sunup, cockcrownoun
the first light of day
"we got up before dawn"; "they talked until morning"
Wiktionary
first lightnoun
Dawn; sunrise; the moment at which the sun can first be seen on the horizon.
ChatGPT
first light
First light usually refers to the time of day when light from the sun first appears in the morning, also known as dawn or daybreak. In the field of astronomy, it can also refer to the first time a telescope is used to take an astronomical image after it has been constructed or adjusted.
Wikidata
First light
In astronomy, first light is the first use of a telescope to take an astronomical image after it has been constructed. This is often not the first viewing using the telescope; optical tests will probably have been performed during daylight to adjust the components. The first light image is normally of little scientific interest and is of poor quality since the various telescope elements are yet to be adjusted for optimum efficiency. Usually, a well-known and spectacular astronomical object is chosen. Despite this, a first light is always a moment of great excitement, both for the people who designed and built the telescope, and for the astronomical community. For example, the 200-inch Hale Telescope saw first light January 26, 1949, targeting NGC 2261 under the direction of American astronomer Edwin Powell Hubble. The image was published in many magazines. The Large Binocular Telescope had its first light with a single primary mirror on October 12, 2005, which was a view of NGC 891. The second primary mirror was installed in January 2006 and became fully operational in January 2008. In physical cosmology, first light refers to the light emitted from the first generation of hyperstars, formed less than a billion years after the big bang, which brought to an end cosmological dark ages.
Dictionary of Military and Associated Terms
first light
The beginning of morning nautical twilight; i.e., when the center of the morning sun is 12 degrees below the horizon.
Matched Categories
Numerology
Chaldean Numerology
The numerical value of first light in Chaldean Numerology is: 7
Pythagorean Numerology
The numerical value of first light in Pythagorean Numerology is: 2
Examples of first light in a Sentence
When Thomas Edison installed the first light bulb, that must have been magical. Thomas Edison's how smart technology today should be in the home.
In a sea of stars brimming with new worlds, TESS is casting a wide net and will haul in a bounty of promising planets for further study, this ‘first light’ science image shows the capabilities of TESS’ cameras, and shows that the mission will realize its incredible potential in our search for another Earth.
I often go up there to enjoy wildlife [and]we got up at 4 a.m. and try to be there for first light as its the best time to spot wildlife, the heather is blooming right now, we have not seen any deer there before. There was a mum roe deer and two little ones, like real-life Bambis.
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Translations for first light
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"first light." Definitions.net. STANDS4 LLC, 2024. Web. 25 Apr. 2024. <https://www.definitions.net/definition/first+light>.
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