Jupiter the Wanderer Drifts Among the Stars

Among the fixed stars glides Jupiter, a big, bright, banded fellow who refuses to stay in one spot. The stars keep their patterns for your whole life — the same constellations your grandparents saw. But Jupiter and the other planets wander, drifting slowly against that fixed backdrop, week by week. In fact, the word “planet” comes from an old word meaning wanderer.

A young sky-watcher pointed up. “That’s the brightest star tonight!” Jupiter chuckled, a deep steady glow. “Look closer — am I twinkling?” The watcher squinted. “No… you’re shining really steadily.” “That’s the first clue,” said Jupiter. “Stars twinkle because their tiny pinpoint of light dances through our air. But I’m close enough to show a tiny disc, so my light stays calm and steady. A steady, bright light is often a planet, not a star.”

Then he showed the second clue — the slow one. “Mark where I am tonight against those background stars. Come back in two weeks and check again.” Weeks later, the watcher gasped: Jupiter had drifted, out of line with the stars around him. “The stars didn’t move,” Jupiter said warmly. “I did. That’s what a wanderer does.” He never made the watcher feel silly for the first guess — everyone mistakes a bright planet for a star at first.

Say it with Jupiter, out loud: “A steady light that drifts and stays bright — a wandering planet, not a star, tonight.”

Now the watcher could tell them apart: twinkle and fixed meant star; steady and slowly drifting meant planet. “I found a planet with just my eyes,” he said, amazed. Jupiter beamed his calm broad light. “You did. And now the sky has two kinds of lights for you, not one.”

That is Jupiter’s gift. A planet gives a steady, non-twinkling light and slowly wanders against the fixed stars over weeks. Watch for the calm bright light that won’t stay put — that’s a wanderer, and you can find it with nothing but your own eyes.