The planet Xylanthia is located in the Sirius Star System, which is comprised of three stars; Sirius A, B and C. Sirius A and B orbit around Sirius C. Planet Xylanthia orbits around Sirius C, which is a black dwarf star. Xylanthia is the home-planet of the extraterrestrials that visited Earth and founded Atlantis。
天狼星即大犬座α,是全天最亮的恒星。天狼星是由甲、乙两星组成的目视双星。
甲星是全天第一亮星,属于主星序的蓝矮星。
乙星一般称天狼伴星,是白矮星,总质量比太阳略小(98%)
而半径比地球还小(因此同单位质量比太阳的 重的多)它的密度在1000万吨/立方米左右。
它的物质主要处于简并态,平均密度约3.8×10/厘米。
甲乙两星轨道周期为50.090±0.056年,轨道偏心率为0.5923±0.0019。
天狼星与我们的距离为8.65±0.09光年。
古代中国曾经记载天狼星是红色的 是有星体衰变科学根据的。
天狼星
天狼星 (西方称之为 狗星,大狗星), 天体最亮的恒星 天狼星由 A, B 双星组成
Canis Minor 白矮星 white dwarf(伴星, 天狼伴星) 已知天体中 单位质量密度最重的
Canis Major 蓝矮星 blue dwarf(主星, 天狼星)比太阳亮25倍,热2倍,
直径是太阳的1.7倍,重量2.14倍
天狼星(左) 和 太阳(右)
天狼星
天狼星即大犬座阿尔法星, 其实天狼星最简单的找法就是春节前后晚上22时左右,
往南方天空望去,最亮的一颗,高度角约40度左右,哪颗星最亮,就是天狼星,当然除外近我的行星。
《天官书》是这么记载的
天狼 和 天弓 示意图 (注意:益州,冀州等 位于西北,弓 在其东南)
北极星 Polaris 也被称为Cynosura(狗尾巴),概由小熊星座曾被冠以狗形之故
宇宙的中心 不是 太阳系
有说是 猎户座(Orion)里的 天狼星
著名的埃及金字塔 被证实 是以天狼星为基准和对应而设计的
金字塔的上仰隧道口是正对天狼星的 通天接地
中国古代天文学就很早很发达 但 北非(埃及)人的天文学也许比我们更早更发达
拿日历年历来说 最早的华夏月历 大约是3500-4000年之前才有记录的
埃及人 也是月历 大约比我们早1000年??
而且 古埃历 是以天狼星出现的那一天为元旦(即现在的7月19日,天狼星与日俱升)
那一天起 尼罗河涨水汛洪 使干旱少雨的埃及的农田得以灌溉
中国夏朝时候产生了“夏历”,就是现在的“农历”。
农历正月初一为“岁首”,岁首这天就叫“元旦”。“元者,始也;旦者,晨也。”
“元旦”就是一年的“第一个早晨”。早晨是一天的开始,第一个早晨自然就是一年的开始。
兴趣 苏轼的 密州出猎 词 西北望 射天狼
偶遇 贾鹏芳的 二胡曲 天狼星
想起儿时阅知
假若天狼伴星(白矮星)的一小块儿(比如一枚硬币)
被弄到地球上 那是几列火车也拉它不动的
惊奇
做了这个小作品
(^.~)
The planet Sirius is the brightest star in heavens. As a binary star system, Sirius is composed of a bright star, called Sirius A and, around it, in an elliptical orbit, moves Sirius B, the first ever, identified dwarf star. Sirius B orbits around Sirius A, every 50 years, causing Sirius to wobble and appear therefore to sparkle more brightly than any other star. All stars sparkle, but none like this one!
Long before scientists ever knew of its existence, and long before any equipment existed that could verify its position in the heavens, many of the ancient civilizations knew that behind the brilliant star that is Sirius, lay a dark, shadow star - a black star that is much smaller and more intense. The records of these ancient civilisations, as far back as 3,000 years ago, include drawings of the movement of Sirius and it's dwarf, Sirius B. These ancients believed that Sirius was the source of all life, of all energy, and yet detailed knowledge of Sirius and its dwarf star, has only recently been discovered by modern science.
1994 saw two incredible astronomical and celestial occurrences - the Grand Union of Sirius - when Sirius A and Sirius B came as close to each other as they can be - and the re-positioning of Pluto which came into exact alignment with it. Such an event had not occurred in more than 90.000 years and will not reoccur for another 90,000 years. When this rarest of rare alignments took place, the Vortex of Sirius opened.