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Clark International Airport (IATA: CRK, ICAO: RPLC), known as Diosdado Macapagal International Airport from 2003 to 2014, is an international airport covering portions of the cities of Angeles and Mabalacat within the Clark Freeport and Special Economic Zone in the province of Pampanga, Philippines. It is located 80 kilometers (50 mi) [6 ...
[6] [13] [14] The Phase IV program entered active development in 2023 following the successful completion of the previous three phases. [15] Chang'e 6, launched on 3 May 2024, [16] [17] [18] investigated the topography, composition and subsurface structure of the South Pole–Aitken basin on the far side of the Moon.
e. The Artemis program is a Moon exploration program led by the United States' National Aeronautics and Space Administration (NASA), formally established in 2017 via Space Policy Directive 1. It is intended to reestablish a human presence on the Moon for the first time since the Apollo 17 mission in 1972. The program's stated long-term goal is ...
Every 18.6 years, the angle between the Moon's orbit and Earth's equator reaches a maximum of 28°36′, the sum of Earth's equatorial tilt (23°27′) and the Moon's orbital inclination (5°09′) to the ecliptic. This is called major lunar standstill. Around this time, the Moon's declination will vary from −28°36′ to +28°36′.
The Lunation Number or Lunation Cycle is a number given to each lunation beginning from a specific one in history. Several conventions are in use. The most commonly used was the Brown Lunation Number (BLN), which defines "lunation 1" as beginning at the first new moon of 1923, the year when Ernest William Brown's lunar theory was introduced in the American Ephemeris and Nautical Almanac.
A lunar calendar is a calendar based on the monthly cycles of the Moon 's phases (synodic months, lunations), in contrast to solar calendars, whose annual cycles are based on the solar year. The most widely observed purely lunar calendar is the Islamic calendar. [a] A purely lunar calendar is distinguished from a lunisolar calendar, whose lunar ...
Lunar standstill. A lunar standstill or lunistice is when the Moon reaches its furthest north or furthest south point during the course of a month (specifically a tropical month of about 27.3 days). The declination (a celestial coordinate measured as the angle from the celestial equator, analogous to latitude) at lunar standstill varies in a ...
The lunar effect is a purported correlation between specific stages of the roughly 29.5-day lunar cycle and behavior and physiological changes in living beings on Earth, including humans. A considerable number of studies have examined the effect on humans. By the late 1980s, there were at least 40 published studies on the purported lunar-lunacy ...