astronomical phenomenon
event involving astronomical objects and the universe
solstice
solar event
stellar collision
coming together of two stars caused by gravity, gravitational radiation, or other mechanisms not well understood
syzygy
straight-line configuration of three celestial bodies in astronomy
planetary transit/occultation
event when planets are seen to pass one another from the vantage point of Earth
solar eclipse
natural phenomenon wherein the Sun is obscured by the Moon
conjunction
phenomenon when two astronomical objects or spacecraft have the same right ascension or ecliptic longitude as observed from Earth
Baily's beads
feature of total and annular solar eclipses
apparent movement
apparent movement of celestial bodies caused by the rotation and revolution of the Earth
diamond ring effect
bright spot on the lunar edge since for a few seconds during a solar eclipse
Ellerman bombs
Brightenings in the Sun's chromosphere
moonrise
the first appearance of the Moon over the Earth's eastern horizon
supernova
star exploding at the end of its stellar lifespan
nova
cataclysmic nuclear explosion in a white dwarf star
Appulse
Least apparent distance between one astronomical object and another as viewed from a third body
cosmic microwave background
electromagnetic radiation as a remnant from an early stage of the universe in Big Bang cosmology
supernova impostor
stellar explosion
eclipse
astronomical event where one body hides another
gravitational collapse
contraction of an astronomical object due to the influence of its own gravity
total solar eclipse
solar eclipse which occurs when the Moon completely obscures the Sun
solar radio emission
radio waves produced by the Sun
Wow! signal
1977 narrowband radio signal from SETI
meteor shower
celestial event caused by streams of meteoroids entering Earth's atmosphere
sunset
daily disappearance of the Sun below the western half of the horizon
sunrise
instant at which the upper edge of the Sun appears over the eastern horizon in the morning
secular variation
long-term non-periodic variation
solar phenomena
sunspots, flares, eruptions, etc. on the surface of the Sun
hybrid solar eclipse
solar eclipse which shifts between a total and annular eclipse
equinox
astronomical event where the Sun is directly above the Earth's equator
planetary differentiation
formation of distinct layers in a planet
quasi-periodic oscillation
type of observed X-ray astronomy pattern
fast radio burst
high-energy astrophysical phenomenon manifested as a transient radio pulse lasting only a few milliseconds
partial eclipse
astronomical event where one body only partially hides another
heliacal rising
Rising of stars prior to sunrise
Transit of Phobos from Mars
Transit of a Moon from Mars
Glitch
sudden increase in the rotational frequency of a rotation-powered pulsar
transient astronomical event
briefly-observed celestial event
tidal disruption event
pulling apart of a star by tidal forces when it gets too close to a supermassive black hole
The Day the Earth Smiled
July 2013 event
Failed supernova
Star that dies but does not explode
Radiative levitation
stellar phenomenon
guest star
a term in Chinese astronomy where a star which has suddenly appeared in a place where no star had previously been observed and becomes invisible again after some time
geomagnetic storm
temporary disturbance of the Earth's magnetosphere caused by a disturbance in the interplanetary medium
meteor
visible streak of light from a meteoroid that enters the Earth's atmosphere
impact event
collision of two astronomical objects with measurable effects
partial solar eclipse
solar eclipse which occurs when the Moon only partially obscures the Sun
annular solar eclipse
solar eclipse which occurs when the Sun and Moon are exactly in line with the Earth, but the apparent size of the Moon is smaller than that of the Sun
cosmic background radiation
type of spectrum apart from the Big Bang, whichever shows the universe
gravitational wave event
physical event
meteorite fall
falling of meteors