「木星合土星」，要等到12月21日才會發生。在此之前，大家可以見證木星和土星日漸靠近。兩星視覺上角距逐漸由今天的兩度左右（約四個月球大小），兩星期後縮減至約半度，最終「世紀相遇」。但首先，你得辨認出木星和土星…… 現時兩顆行星位於人馬座，黃昏8時半前在西南方低空出現。木星比較光亮（視星等為-2等），顏色偏黃，是附近天區最光亮的星體，在鬧市中都可以見到，而在離木星不遠的東方（或左上方）會找到比較暗淡（視星等為0.6等）的土星。兩顆亮星一同出現，相信不難辨認！ 在十二月的夜空中尋找木星和土星，並拍照紀錄它們的距離，看看兩星如何越來越近最後「親吻」（實際上保持了至少7億3千萬公里的非常安全社交距離）。
【#AstronomyInfo】Getting closer and closer: Jupiter and Saturn (Part I) The curator forecast the Jupiter-Saturn conjunction last week. The conjunction wouldn’t happen until 21 December. Before that, you can witness their rendezvous. Visually, Jupiter and Saturn are separated by about 2 degrees (around four times the moon’s size) today but are getting closer and closer to about 0.5 degree in two weeks. Before that, you have to recognise them first in the vast night sky. Jupiter and Saturn are now in Sagittarius. Look low in the southwest sky before 8:30 pm, you can find a bright yellow star (apparent magnitude = -2) which is Jupiter. It can be easily observable even in the city as it is the brightest star in the area. Next to Jupiter you can find a dimmer Saturn (apparent magnitude = 0.6, still bright enough to see in the city) and in the east (or upper left) of Jupiter. With two bright stars so close together, it should be easy to find them! The curator invites you to look for Jupiter and Saturn, take pictures, and check back day after day to see when they will “kiss” (but still separated by a very safe social distance of at least 730 million km). Will you accept this challenge?
文字Credit：香港太空館
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