The word "obscuration" is usable in written English and is well written.
It can be used in contexts related to the act of making something obscure or unclear, often in scientific or technical discussions. Example: "The obscuration of the stars during the eclipse was a breathtaking sight." Alternatives include "obscuring" and "concealment."
The above-cited text is particularly interesting because it clearly describes an obscuration of the Sun, which, though causing dusk conditions, was not quite total where it was seen.
The faint galaxy, which lies in the direction of the constellation Sagittarius, had remained undetected because of obscuration caused by stars and dust lying in the disk of the Milky Way.
The Crab Nebula is unique in being a young supernova remnant and relatively free from obscuration, while Tycho's and Kepler's supernovae are conspicuous radio sources, radiating by synchrotron emission; in neither case has a detectable pulsar been found.
Occultation, complete obscuration of the light of an astronomical body, most commonly a star, by another astronomical body, such as a planet or a satellite.
In 1926 he showed that, apart from a "zone of avoidance" (region characterized by an apparent absence of galaxies near the plane of the Milky Way caused by the obscuration of interstellar dust), the distribution of galaxies in space is close to uniform when averaged over sufficiently large scales, with no observable boundary or edge.
For instance, the eclipse of May 1, 174 bce, is described in the following words: From the beginning of the eighth hour till the end of the tenth in Alexandria there was an eclipse of the Moon which reached a maximum obscuration of 7 digits from the north; so mid-eclipse occurred 21/2 seasonal hours after midnight, which corresponds to 21/3 equinoctial hours.
From the beginning of the eighth hour till the end of the tenth in Alexandria there was an eclipse of the Moon which reached a maximum obscuration of 7 digits from the north; so mid-eclipse occurred 21/2 seasonal hours after midnight, which corresponds to 21/3 equinoctial hours.
[Time interval of] 35 degrees for obscuration and clearing up.
The Galaxy contains more than 150 globular clusters (the exact number is uncertain because of obscuration by dust in the Milky Way band, which probably prevents some globular clusters from being seen).
