BC
A notation used to specify years before the year 1 in the current numbering system (note that 1 BC immediately precedes 1 ; there is no year 0). BC stands for "before Christ," and is sometimes written instead as , "before the Common Era." ...
202 BC - 220 AD
The Han Dynasty in 2 CE (brown), with military garrisons (yellow dots), dependent states (green dots), and tributary vassal states (orange dots) as far as the Tarim Basin in the western part of Central Asia
Capital ...
AC = BC = r
The length c of the baseline AB is much less than r. That means that the angle α between AC and BC is small; that angle is known as the parallax of C, as viewed from AB.
By 300 BC, black hieroglyphs were painted on white stucco plaster and stone by Mayans in a pyramid complex in the Peten jungle of northern Guatemala near the future town of San Bartolo. Other writing in the region dates to 600 B.C.
BC (the primary of which is gamma2) form a very close binary with an orbit of 61 years: 5.5, 6.3; currently the component is at PA 104º and separation 0.5"
Kappa Andromedae is a wide and rather faint binary: 4, 11; 194º, 46.8".
6 BC: Earliest theorized date for birth of Jesus
Jesus
Jesus of Nazareth , also known as Jesus Christ, is the central figure of Christianity and is revered by most Christian churches as the Son of God and the Incarnation ....
of Nazareth ...
52 BC
Chinese astronomer Ken Shou-Ch’ang builds a form of armillary ring, a metal circle representing the equator and used to observe the stars.
50 BC to
41 BC ...
134 BC - Hipparchus creates the magnitude scale of stellar apparent luminosities
1596 - David Fabricius notices that Mira's brightness varies
1672 - Geminiano Montanari notices that Algol's brightness varies ...
*240 BC and earlier: Historical records show that Chinese astronomers observed the comet's appearance in 240 BC and possibly as early as 2467 BC.
~250 BC
Aristarchus infers that the Sun is much larger and farther than the Moon.
1543 ...
In 6 BC, these three planets were fairly close together in the constellation Pisces. The planets only got within about 8° of one another and it seems unlikely that this would have been called a 'star'.
Stationary point of Jupiter ...
3500 BC: Senet, possibly the world's oldest board game
3500 BC: Faience, world's earliest known earthenware
Dynastic ...
In 55 BC, Lucretius in his poem, The Nature of the Universe, advanced the idea of an infinite universe.
In 46 BC, the Roman astronomer Sisogenes proposed a modification that would bring calendar dates and observations back into step. According to the Julian Calendar, a standard year has 365 days, but every fourth year there is a leap year of 366 days.
By 450 BC, the Greek civilization was in its ascendancy. The historian Herodotus (ca 460 BC) mentions that Thales was able to predict the year when a total solar eclipse would occur. Details of how this prediction was made do not survive.
(276-194 BC) was a Greek scholar who was the first person to determine the circumference of the Earth. He compared the midsummer's noon shadow in deep wells in Syene (now Aswan on the Nile in Egypt) and Alexandria.
Before 44 BC, the month of July was known as Quintilis, from the Latin "quintus" for fifth. It was renamed by the Roman consul Marcus Antonius in honor of Julius Caesar, who was born on July 15th.
The tight BC pair is relatively bright in x-rays
near their poles (and seems to be transferring
mass), with each star passing in front of the
other every three hours. (The red arrow points
to orbital direction, while the graph plots ...
Around 350 BC, the great Aristotle declared that the Earth was a sphere (based on observations he made about which constellations you could see in the sky as you travelled further and further away from the equator) and during the next hundred years ...
About 1100 BC the Avenue was extended from Stonehenge eastward and then southeastward to the River Avon, a distance of about 2,780 m (9,120 feet). This suggests that Stonehenge was still in use at the time.
384 BC) wrote about comets in his _Meteorology_ (~350 BC). However, this talks about comets in general, I haven't read the whole thing to see if he discusses any specific apparitions.
Hipparchus (c. 190 BC - c. 120 BC) measuring the positions of the stars ...
Discovered by Hipparchus around 130 BC as a slow shift of the vernal equinox around the ecliptic (i.e. around the zodiac).
(It should be noted, however, that the heliocentric idea was first put forth by Aristarcus of Samos in the 3rd century BC, a fact known to Copernicus but long ignored.) ( 12k gif; 129k jpg; more) corona ovoid-shaped feature.
reasonably dark conditions to see, it is one of the sky's rare very hot and blue class O (O9) supergiants, its modest apparent brightness the result of its huge distance of 4800 light years, the light you see having left the star around 2800 BC! ...
Eratosthenes (276-197 BC) was born in Cyrene (now Shahhat, Libya). After studying in Alexandria and Athens he became the director of the Library in Alexandria.
Starting with the vernal equinox and then proceeding eastward along the ecliptic, each of the divisions is named for the constellation situated within its limits in the 2d century BC.
It is easy to show that rays falling on the mirror in the direction BC will be reflected along BD. One construction of the instrument, described in Jamin's Cours de physique, is shown in fig. 3.
Berenice was a real person who, in the third century BC, married her brother, Ptolemy III Euergetes, as was the tradition of the Egyptian royal family. Berenice was reputedly a great horsewoman who had already distinguished herself in battle.
Apollo In the early 3rd millennium BC, a group of powerful immortal beings from Pollux IV landed on Earth in the Mediterranean region. These aliens considered themselves to be gods and presented themselves as such to the primitive Humans.
BC-250?BC) was an ancient Greek astronomer who was the first person to propose a heliocentric model of the Solar System. Aristarchus realized that the Earth rotates on its axis and revolves around the Sun.
The calendar of the western world is based on the Julian calendar, which dates back to the time of Julius Caesar (44 BC).
Thuban (in southern Draco) was the "pole star" around 3000 BC. The next naked-eye star that served as the Earth's pole star was Kochab in the bowl of the Little Dipper from about 1900 BC to 1100 BC.
This constellation were named by the greek Konon of Samos (247 BC) after the hair of Egyptian Queen Berenice. She was the wife of King Ptolemy III Euergestes.
During the second century BC, a man by the name of Hipparchus calculated the length of the tropical year within six minutes of the currently known value.
It's said that the philospher Heraclitus of Pontus (390-310 BC) concluded that Venus and Mercury revolve around the Sun and that the Earth rotates on its axis.
Around the year 12,000 BC, Vega was the polar star. In northern Polynesia, it was known as "whetu o te tau," or "the year star" because at one point it marked the beginning of a new year.
In 2004, German researchers announced that studies had shown a large body hit the Earth's atmosphere over southern Bavaria in 200 BC. The size of the body was estimated at about 1.
Callipus of Cyzicus (370 - 300 BC) was an ancient Greek who accurately measured the length of the seasons.
(a) Calendar established by Julius Caesar in 46 BC, which overestimated the duration of the sidereal year by 11 minutes and 14 seconds. It was replaced, from 1582, by the Gregorian calendar, by which time it was inaccurate by a total of 10 days.
The above image was taken on July 15, 1999(color component) from Sooke, BC and October 20, 2001 from Harrowsmith, Ontario (brightness component). Cookbook 245 LDC CCD camera was used on Celestron Ultima 8 f3.
Halley's [HAL-lee] Comet has been know since at least 240 BC and possibly since 1059 BC. Its most famous appearance was in 1066 AD when it was seen right before the Battle of Hastings. It was named after Edmund Halley, who calculated its orbit.
This scale is based on that devised by the second-century BC Greek astronomer Hipparchus who labelled the brightest stars as "first magnitude," the next brightest as "second magnitude, ...
[Jupiter's largest moon, Ganymede, may have been recorded by a Chinese astronomer named Gan De in 364 BC, using nothing more than his naked eye! Maybe.
Alderamin lies close to the precessional path of the north celestial pole, so that it periodically comes within 3° of being an exact pole star - a status it last held in about 18,000 BC and will hold again about 5,500 years from now.
The geometry developed by the Greek Euclid about 300 BC. Euclidean geometry, like all geometries, deduces certain results from a set of starting assumptions.
The concept of measuring and comparing the brightness of stars can be traced back to the Greek astronomer and mathematician Hipparchus (190 - 120 BC).
A system of counting days from noon 1st January 4713 BC. The name has nothing to do with Julius Caesar but was invented by the mathematician Scaliger who named it in honour of his father, Julius Scaliger.
One of the most brilliant minds in the ancient world was a fellow who lived in Ionia (the islands surronding Greece) in the sixth century BC. His name was Democritus of Abdera.
Its various stages are dated to have been built between 3,000-2,000 BC. But, there are much older megalithic sites. Certain megaliths in Brittany are as old as 4,600 B.C.
1, 4713 BC. The JD is always half a day off from Universal Time, because the current definition of JD was introduced when the astronomical day was defined to start at noon (prior to 1925) instead of midnight. Thus, 1995 Oct. 10.0 UT = JD 2450000.5.
With TheSky, you can view the stars as they were seen by Anaximander (the man who invented the star chart in 550 BC), or you can view them as they will be seen tonight - without the clouds, of course. But that's not all.
magnitude The method we use today to compare the apparent brightness (magnitude) of stars began with Hipparchus, a Greek astronomer who lived in the second century BC. Hipparchus called the brightest star in each constellation "first magnitude.
Its appearances were recorded by the Babylonians in approximately 3,000 BC, and it also is mentioned prominently in the astronomical records of a number of other ancient civilizations, including those of China, Central America, Egypt, and Greece.
Dominion Radio Astrophysical Observatory (DRAO)
A collection of radio telescopes in Penticton, BC. The telescopes are involved in important astronomical research of the universe, including the study of the interstellar medium.
...
Origin of the constellation: Ancient Greece (Ptolemaeus). It was probably originally named by the Greek philosopher Eudoxos in 400 BC
Named stars:
Info: ...
Julian Date (JD)
the interval of time in days and fraction of a day since 1 January 4713 BC, Greenwich noon.
K ...
The constellations are just distinctive and easy-to-remember patterns of stars. Most of the famous ones were invented before the beginning of recorded history. Orion, for example, has a history dating to before about 4000 BC.
Hercules, the Roman Hero, is best known for his twelve labours, mentioned throughout the Greek constellation legends as Herakles, who is sometimes identified with the much older (5000 BC) Sumerian strong man Gilgamesh.
universe, which was the prevailing theory for over 1000 years, was deeply ingrained in the prevailing philosophy and religion. (It should be noted, however, that the heliocentric idea was first put forth by Aristarcus of Samos in the 3rd century BC, ...
 See also: Time, Period, Second, Century, Year
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