In astronomy, air mass or airmass is a measure of the amount of air along the line of sight when observing a star or other celestial source from below...

Arthur–Merlin protocol Adrenomedullin, a protein Air mass (astronomy), measure of the amount of air along the line of sight in astronomical observations...

The air mass coefficient defines the direct optical path length through the Earth's atmosphere, expressed as a ratio relative to the path length vertically...

Air mass (solar energy), pertaining to the air mass coefficient; the air in path of solar light through the atmosphere Airmass (astronomy), the mass of...

index (e.g., glass) and n2 is the smaller refractive index (e.g., air). Air mass (astronomy) Lagrangian optics Hamiltonian optics Fermat's principle Optical...

This is usually obtained by observation of stellar occultations. Air mass (astronomy) Absorptance Actinometer Aerosol Angstrom exponent Attenuation coefficient...

air, wood, concrete, rain). See the article on path loss for more information on signal loss in wireless communication. Acoustic attenuation Air mass...

environment, and another 10 dB to overcome the fading due to movement. Air mass (astronomy) Radio propagation model Log-distance path loss model Two-ray ground-reflection...

Observational astronomy is a division of astronomy that is concerned with recording data about the observable universe, in contrast with theoretical astronomy, which...

mass of the Sun, primarily used in astronomy to compare large masses such as stars or galaxies (≈ 1.99×1030 kg) the mass of a particle, as identified with...

atmospheric refraction Sound waves affected by air density variations lead to atmospheric focusing. Air mass (astronomy) Atmospheric optics Electromagnetic radiation...

of the Universe". Mass units conversion calculator Mass units conversion calculator JavaScript Portals: Physics Mathematics Astronomy Stars Outer space...

of astronomy is a list of definitions of terms and concepts relevant to astronomy and cosmology, their sub-disciplines, and related fields. Astronomy is...

the refraction index just a simple Shooting method can be used. Air mass (astronomy) § Calculation Ray tracing (physics) Radio propagation model Path...

respectively, of the mass of the Sun in the photosphere. All heavier elements, called metals in astronomy, account for less than 2% of the mass, with oxygen (roughly...

In astronomy, extinction is the absorption and scattering of electromagnetic radiation by dust and gas between an emitting astronomical object and the...

Indian astronomy refers to astronomy practiced in the Indian subcontinent. It has a long history stretching from pre-historic to modern times. Some of...

industrial air pollution. The average molecular weight of dry air, which can be used to calculate densities or to convert between mole fraction and mass fraction...

compilation of initialisms and acronyms commonly used in astronomy. Most are drawn from professional astronomy, and are used quite frequently in scientific publications...

X-ray astronomy is an observational branch of astronomy which deals with the study of X-ray observation and detection from astronomical objects. X-radiation...

bodies falling through air, area density is important because resistance depends on area, and gravitational force is dependent on mass. Bone density is often...

upward moving air at the leading edge. The precise location of the rising air mass is fairly easy to predict from the orientation of the clouds. "Wave lift"...

Neutrino astronomy is the branch of astronomy that gathers information about astronomical objects by observing and studying neutrinos emitted by them with...

In astronomy, the geocentric model (also known as geocentrism, often exemplified specifically by the Ptolemaic system) is a superseded description of...

Cosmic ray astronomy is a branch of observational astronomy where scientists attempt to identify and study the potential sources of extremely high-energy...

Density (volumetric mass density or specific mass) is a substance's mass per unit of volume. The symbol most often used for density is ρ (the lower case...

This is a timeline of astronomy. It covers ancient, medieval, Renaissance-era, and finally modern astronomy. Mayan astronomers discover an 18.7-year cycle...

discovery to his family over breakfast; Madan passed the suggestion to astronomy professor Herbert Hall Turner, who cabled it to colleagues at Lowell on...

Mass psychogenic illness (MPI), also called mass sociogenic illness, mass psychogenic disorder, epidemic hysteria or mass hysteria, involves the spread...

Astronomy in China has a long history stretching from the Shang dynasty, being refined over a period of more than 3,000 years. The ancient Chinese people...