早朝の空は季節を先取りしている

【さそり座】

　早くも２月中旬となり、早朝に南の空を見ると、すでに夏の星座である「さそり座」が見える季節です。その形は尾をくねらせ、恰も、地上を睨んでいるかの如くです。このような個性的な形をした星座も珍しいです。

　時間と共に西に進んで見える頭の部分もユニークで、たまたま、この星座は太陽が通過する道である「黄道」に接しており、その位置は高くも低く見なく見やすいです。特に、首の部分にある「アンタレス」という星は全天で２１個ある一等星の一つで、その特徴は明るい橙色です。

　前述の通り、「さそり座」は黄道近くに位置するので、時折、惑星もこの星座に接近します。中でも火星が接近すると、火星も明るい橙色をしており、似たような星が近くに二つ並びます。このため、アンタレスとは「火星に対抗する」という意味を持ちます。

　このように早朝には、すでに夏の星座が見えるのは、地球が軌道上を毎秒約２９㎞の速度で反時計回りに公転しているからであり、現在、地球の公転軌道上の位置は「かに座」と「しし座」の方向に来ています。

Dear my friends abroad

　It's already mid-February, of course in solar calendar, though January 2 in lunisolar calendar and if you look at the southern sky early in the morning around five o'clock recently, you can already see the summer constellation "the Scorpion". Its shape is as if it were glaring at our ground, with its tail twisting. Constellation with such unique shape is also rare.

　The part of the head that appears to move westward usually is also unique, and coincidentally, this constellation is adjacent to the ecliptic which the sun passes, so that it easy for earthlings in Northern Hemisphere to see without looking too high or too low. In particular, the star "Antares" in its neck is one of the 21 first-magnitude stars in the sky, and its characteristic is a bright orange color.

　As I mentioned above, "Scorpio" is located near the ecliptic, so planets sometimes approach this constellation. In particular, when Mars approaches, as you know, it is also bright orange, so that the two similar stars line up nearby. For this reason, Antares has the meaning of "opposing Mars".

　The reason why we earthlings can already see the summer constellations early in the morning is because the Earth is revolving counterclockwise in its evolving orbit at a speed of about 29 km per second. Our earth is coming towards the direction of constellations between "Cancer" and "Leo."

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