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Codex Sangallensis 250
The Codex Sangallensis 250 is a manuscript which was compiled in the latter half of the 9th century at the abbey library of Saint Gall, where it remains today. It is an Astronomy, astronomical and Date of Easter, computistical, 645-page-long encyclopedia written in Latin. The pages are made of parchment with a height of 24.7 cm and a width of 18 cm. The text was structured in a single column, with approximately 23 or 24 lines per page. It was mostly written in Carolingian minuscule, though the titles were either in rustic capitals or uncial script. Both the texts and the illustrations in the codex were created by multiple scribes, as can be seen by the differing handwritings and drawing styles. The manuscript was most likely compiled under the supervision of Notker the Stammerer, Notker Balbulus during his time as a librarian, and the margins of page 28 feature some glosses written by him. Historical background The didactic poem ''Phainomena'' ("Appearances") by the Greek poet A ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
De Astronomia
__NOTOC__ ''De astronomia'' (; ''Concerning Astronomy'') is a book of stories written in Latin, probably during the reign of Augustus ( 27 BC AD 14). Attributed to "Hyginus", the book's true author has been long debated. However, the art historian Kristen Lippincott argues that the author was likely Gaius Julius Hyginus, who served as the superintendent of the Palatine library under Caesar Augustus. The text describes 47 of the 48 Ptolemaic constellations, centering primarily on the Greek and Roman mythology surrounding the constellations, though there is some discussion of the relative positions of stars. The stories it contains are chiefly based on '' Catasterismi'', a work that was traditionally attributed to Eratosthenes. The ''Astronomia'' is a collection of abridgements. According to the ''Encyclopædia Britannica'' Eleventh Edition, the style and level of Latin competence and the elementary mistakes (especially in the rendering of the Greek originals) were held to pr ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Orbit Of The Moon
The Moon orbits Earth in the retrograde and prograde motion, prograde direction and completes one orbital period, revolution relative to the March Equinox, Vernal Equinox and the fixed stars in about 27.3 days (a tropical month and sidereal month), and one revolution relative to the Sun in about 29.5 days (a synodic month). On average, the lunar distance, distance to the Moon is about from Earth's centre, which corresponds to about 60 Earth radii or 1.28 light-seconds. Earth and the Moon orbit about their barycentre (common centre of mass), which lies about from Earth's centre (about 73% of its radius), forming a satellite system called the Earth–Moon system. With a mean orbital speed around the barycentre of , the Moon covers a distance of approximately its diameter, or about half a degree on the celestial sphere, each hour. The Moon differs from most Regular moon, regular satellites of other planets in that its orbital plane (astronomy), orbital plane is closer to the ec ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Ecliptic
The ecliptic or ecliptic plane is the orbital plane of Earth's orbit, Earth around the Sun. It was a central concept in a number of ancient sciences, providing the framework for key measurements in astronomy, astrology and calendar-making. From the perspective of an observer on Earth, the Sun's movement around the celestial sphere over the course of a year traces out a path along the ecliptic against the fixed stars, background of stars – specifically the Zodiac constellations. The planets of the Solar System can also be seen along the ecliptic, because their orbital planes are very close to Earth's. The Moon's orbital plane is also similar to Earth's; the ecliptic is so named because the ancients noted that eclipses only occur when the Moon is crossing it. The ecliptic is an important Plane of reference, reference plane and is the basis of the ecliptic coordinate system. Ancient scientists were able to calculate Earth's axial tilt by comparing the ecliptic plane to that of ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Neume
A neume (; sometimes spelled neum) is the basic element of Western and some Eastern systems of musical notation prior to the invention of five-line staff (music), staff notation. The earliest neumes were inflective marks that indicated the general shape but not necessarily the exact Musical note, notes or rhythms to be sung. Later developments included the use of heightened neumes that showed the relative Pitch (music), pitches between neumes, and the creation of a four-line musical staff that identified particular pitches. Neumes do not generally indicate rhythm, but additional symbols were sometimes juxtaposed with neumes to indicate changes in Articulation (music), articulation, duration (music), duration, or tempo. Neumatic notation was later used in medieval music to indicate certain patterns of rhythm called rhythmic modes, and eventually evolved into Modern musical symbols, modern musical notation. Neumatic notation remains standard in modern editions of plainchant. Etymol ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Easter Cycle
The Easter cycle is the sequence of the seasons and days in the Christian liturgical year which are pegged to the date of Easter, either before or after it. In any given calendar year, the timing of events within the Easter cycle is dependent on the calculation of the date of Easter itself. Western Christianity The following liturgical seasons and days, celebrated by various traditions within Western Christianity, are celebrated a fixed amount of time either before or after the day of Easter. * Pre-Lent ** Septuagesima ** Sexagesima ** Quinquagesima * Lent ** Ash Wednesday ** Ember Days of Lent ** Laetare Sunday ** Passiontide *** Passion Sunday *** Holy Week **** Palm Sunday **** Holy Monday **** Holy Tuesday **** Holy Wednesday **** Triduum ***** Holy Thursday (Chrism Mass / Mass of the Lord's Supper) ***** Good Friday ***** Holy Saturday ***** Easter Vigil * Easter * Eastertide ** Octave of Easter *** Easter Monday *** Easter Tuesday *** Easter Wednesday *** Easter Thur ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Metonic Cycle
The Metonic cycle or enneadecaeteris (from , from ἐννεακαίδεκα, "nineteen") is a period of almost exactly 19 years after which the lunar phases recur at the same time of the year. The recurrence is not perfect, and by precise observation the Metonic cycle defined as 235 synodic months is just 2 hours, 4 minutes and 58 seconds longer than 19 tropical years. Meton of Athens, in the 5th century BC, judged the cycle to be a whole number of days, 6,940. Using these whole numbers facilitates the construction of a lunisolar calendar. A tropical year (about 365.24 days) is longer than 12 lunar months (about 354.36 days) and shorter than 13 of them (about 383.90 days). In a Metonic calendar (a type of lunisolar calendar), there are twelve years of 12 lunar months and seven years of 13 lunar months. Application in traditional calendars In the Babylonian and Hebrew lunisolar calendars, the years 3, 6, 8, 11, 14, 17, and 19 are the long (13-month) years of the Metonic c ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Planetary Orbit
In celestial mechanics, an orbit (also known as orbital revolution) is the curved trajectory of an object such as the trajectory of a planet around a star, or of a natural satellite around a planet, or of an artificial satellite around an object or position in space such as a planet, moon, asteroid, or Lagrange point. Normally, orbit refers to a regularly repeating trajectory, although it may also refer to a non-repeating trajectory. To a close approximation, planets and satellites follow elliptic orbits, with the center of mass being orbited at a focal point of the ellipse, as described by Kepler's laws of planetary motion. For most situations, orbital motion is adequately approximated by Newtonian mechanics, which explains gravity as a force obeying an inverse-square law. However, Albert Einstein's general theory of relativity, which accounts for gravity as due to curvature of spacetime, with orbits following geodesics, provides a more accurate calculation and understanding o ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Celestial Globe
Celestial globes show the apparent positions of the stars in the sky. They omit the Sun, Moon, and planets because the positions of these bodies vary relative to those of the stars, but the ecliptic, along which the Sun moves, is indicated. There is an issue regarding the "handedness" of celestial globes. If the globe is constructed so that the stars are in the positions they actually occupy on the imaginary celestial sphere, then the star field will appear reversed on the surface of the globe (all the constellations will appear as their mirror images). This is because the view from Earth, positioned at the centre of the celestial sphere, is of the gnomonic projection inside of the celestial sphere, whereas the celestial globe is orthographic projection as viewed from the outside. For this reason, celestial globes are often produced in mirror image, so that at least the constellations appear as viewed from Earth. This ambiguity is famously evident in the astronomical ceiling ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Astrological Sign
In Western astrology, astrological signs are the twelve 30-degree sectors that make up ecliptic, Earth's 360-degree orbit around the Sun. The signs enumerate from the first day of spring, known as the First Point of Aries, which is the Equinox (celestial coordinates), vernal equinox. The astrological signs are Aries (astrology), Aries, Taurus (astrology), Taurus, Gemini (astrology), Gemini, Cancer (astrology), Cancer, Leo (astrology), Leo, Virgo (astrology), Virgo, Libra (astrology), Libra, Scorpio (astrology), Scorpio, Sagittarius (astrology), Sagittarius, Capricorn (astrology), Capricorn, Aquarius (astrology), Aquarius, and Pisces (astrology), Pisces. The Western zodiac originated in Babylonian astrology, and was later influenced by the Hellenistic astrology, Hellenistic culture. Each sign was named after a constellation planets in astrology, the sun annually moved through while crossing the sky. This observation is emphasized in the simplified and popular sun sign astrology. Ove ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Constellation
A constellation is an area on the celestial sphere in which a group of visible stars forms Asterism (astronomy), a perceived pattern or outline, typically representing an animal, mythological subject, or inanimate object. The first constellations were likely defined in prehistory. People used them to relate stories of their beliefs, experiences, creation myth, creation, and mythology. Different cultures and countries invented their own constellations, some of which lasted into the early 20th century before today's constellations were internationally recognized. The recognition of constellations has changed significantly over time. Many changed in size or shape. Some became popular, only to drop into obscurity. Some were limited to a single culture or nation. Naming constellations also helped astronomers and navigators identify stars more easily. Twelve (or thirteen) ancient constellations belong to the zodiac (straddling the ecliptic, which the Sun, Moon, and planets all traver ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Annals
Annals (, from , "year") are a concise history, historical record in which events are arranged chronology, chronologically, year by year, although the term is also used loosely for any historical record. Scope The nature of the distinction between annals and history is a subject based on divisions established by the ancient Romans. Verrius Flaccus, quoted by Aulus Gellius, stated that the etymology of ''history'' (from Ancient Greek, Greek , , equated with Latin , "to inquire in person") properly restricts it to primary sources such as Thucydides's which have come from the author's own observations, while annals record the events of earlier times arranged according to years. Hayden White distinguishes annals from chronicles, which organize their events by topics such as the reigns of kings, and from histories, which aim to present and conclude a narrative implying the moral importance of the events recorded. Generally speaking, annalists record events drily, leaving the entries u ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
