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Feast of Christ the King
The Feast of Christ the King, also called Solemnity of Christ the King, was instituted by Pope Pius XI in 1925 and now closes the Catholic liturgical year before Advent.
Feast of Corpus Christi
The Feast of Corpus Christi, also called Fronleichnam or Corpus Domini, is a Catholic solemnity celebrating the Eucharist, best known for its public procession with the consecrated Host.
Feast of Saints Peter and Paul
The Feast of Saints Peter and Paul, or Solemnity of Saints Peter and Paul, is a liturgical feast on 29 June honoring the martyrdom of the apostles Peter and Paul in Rome.
Feast of the Conversion of Saint Paul
The Feast of the Conversion of Saint Paul is a Christian feast kept on 25 January, commemorating Saul's transformation into the Apostle Paul on the road to Damascus.
Feast of the Exaltation of the Holy Cross
The Feast of the Exaltation of the Holy Cross, kept on 14 September by Catholics and Orthodox, commemorates Saint Helena's finding of the True Cross in Jerusalem.
Feast of the Immaculate Conception
The Feast of the Immaculate Conception, or Solemnity of the Immaculate Conception, is a Catholic holy day on December 8 celebrating Mary's preservation from original sin.
February
February is the second month of the Gregorian calendar, with 28 days in common years and 29 in leap years, keeping the calendar aligned with the solar year.
February 13–17, 2021, North American winter storm
Winter Storm Uri, a February 2021 winter storm and Arctic outbreak, brought record cold and snow to the central United States and collapsed the Texas power grid.
February 2006 North American blizzard
The February 2006 North American blizzard was a powerful nor'easter that moved up the East Coast on February 11 and 12, 2006, setting New York City's record snowfall of 26.9 inches.
February 2007 North American blizzard
The February 2007 North American blizzard was a major winter storm that crossed the United States from February 12 to 14, 2007, causing at least 15 deaths.
February 2013 North American blizzard
The February 2013 North American blizzard, also known as Winter Storm Nemo, buried the northeastern United States under up to 40 inches of snow on February 8 and 9, 2013.
February 2026 North American blizzard
The February 2026 North American blizzard, or Winter Storm Hernando, comprised two severe storms, including the Blizzard of 2026 that gave Providence its largest snowstorm on record.
Fecal pellet
In oceanography, a fecal pellet is a compacted package of organic waste egested by zooplankton or fish, and a major vehicle of the biological carbon pump.
Federal Competitiveness and Statistics Centre
The Federal Competitiveness and Statistics Centre (FCSC) is the UAE federal agency that produces official national statistics and monitors the country's performance in global competitiveness reports.
Federal Reference Method
A Federal Reference Method (FRM) is an EPA-designated method for sampling and analyzing ambient air, defining how US states measure compliance with the National Ambient Air Quality Standards.
Federico Ardila
Federico Ardila, also known as Federico Ardila-Mantilla, is a mathematician working at the intersection of combinatorics, algebra, and geometry, known for bringing geometric and Hodge-theoretic tools into matroid theory.
Federico Capasso
Federico Capasso is an Italian-born American applied physicist at Harvard who invented the quantum cascade laser at Bell Labs and leads metasurface flat optics research.
Fedor Bogomolov
Fedor Bogomolov (Фёдор Алексеевич Богомолов), born 1946 in Moscow, is a mathematician in algebraic geometry and number theory, professor at New York University's Courant Institute since 1994.
Fedor Jelezko
Fedor Jelezko, born 1971, is a German physicist and professor at Ulm University known for quantum control of nitrogen-vacancy centers in diamond as nanoscale sensors.
Feedback
Feedback, also known as feedback loops, is the howling or squealing of a public address system when amplified sound is picked up again by its own microphone.
Feedback arc set
A feedback arc set of a directed graph is a set of arcs whose removal makes the graph acyclic; finding a smallest one is NP-hard.
Feedback vertex set
A feedback vertex set, also known as a cycle cutset, is a set of vertices whose removal leaves a graph acyclic; finding the smallest one is an NP-complete problem.
Feedback-based quantum state stabilization
Feedback-based quantum state stabilization is a quantum control technique that continuously measures a quantum system and applies real-time corrections to hold it near a target state despite decoherence.
FeGe
FeGe is an iron germanide compound with kagome layers of iron atoms, known as the kagome metal in which a charge density wave develops inside an antiferromagnetic state.
Fei‐Fei Jin
Fei-Fei Jin is a climate dynamicist and Professor of Atmospheric Sciences at the University of Hawaii at Manoa, known for his 1997 recharge oscillator model of El Niño.
Feige 110
Feige 110 is a hot, hydrogen-rich subdwarf OB star of visual magnitude 11.8, discovered in 1958 and widely used as a primary standard for astronomical spectrophotometric flux calibration.
Feige 34
Feige 34 is a hot, helium-poor subdwarf O star in the constellation Ursa Major, cataloged in Jacques Feige's 1958 survey and used for decades to calibrate spectrographs.
Feigenbaum constants
The Feigenbaum constants are two universal numbers, δ ≈ 4.6692 and α ≈ −2.5029, governing how many nonlinear systems approach chaos through period doubling, discovered by Mitchell Feigenbaum in 1975.
Feit–Thompson theorem
The Feit–Thompson theorem, also called the odd order theorem, states that every finite group of odd order is solvable, proved by Walter Feit and John Thompson in 1963.
FEKO
Feko is a commercial computational electromagnetics software developed by Altair Engineering, known for hybridizing multiple solution methods and used in antenna design, EMC, and radar analysis across telecommunications, aerospace, and defense.