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Usually, the term sky informally refers to a perspective from the Earth's surface; however, the meaning and usage can vary. An observer on the surface of the Earth can see a small part of the sky, which resembles a dome (sometimes called the sky bowl) appearing flatter during the day than at night. [1]
[1] degree day Deviation of one-degree temperature for one day from an arbitrary standard, usually the long-term average temperature for a place. [2] dell A small, secluded hollow, usually within a grassy, park-like, partially wooded valley. delta A landform at the mouth of a river where the main stem splits up into several distributaries. It ...
Sky conditions are estimated in terms of how many eighths of the sky are covered in cloud, ranging from 0 oktas (completely clear sky) through to 8 oktas (completely overcast). In addition, in the SYNOP code there is an extra cloud cover indicator '9' indicating that the sky is totally obscured (i.e. hidden from view), usually due to dense fog ...
These Earth Day quiz questions and answers will help you learn more about the world around you.
2MASP – (catalog) Two-micron all sky survey prototype, an early version of the 2MASS catalog; 2MASS – (observing program/catalog) Two-Micron All Sky Survey, an all-sky survey in the near-infrared; also, the catalog of sources from the survey
The "classic" GeoGuessr game mode consists of five rounds, each displaying a different street view location for the player to guess on a map. The player then receives a score of up to 5,000 points depending on how accurate their guess was, up to 25,000 points for a perfect game.
On any given (sidereal) day/night, a celestial object will appear to drift across, or transit, the observer's upper meridian as Earth rotates, since the meridian is fixed to the local horizon. At culmination , the object contacts the upper meridian and reaches its highest point in the sky.
where N is the day of the year beginning with N=0 at midnight Universal Time (UT) as January 1 begins (i.e. the days part of the ordinal date −1). The number 10, in (N+10), is the approximate number of days after the December solstice to January 1. This equation overestimates the declination near the September equinox by up to +1.5°.