Right outsideSky
The Big Dipper never sets from eastern Massachusetts
When: All year
From eastern Massachusetts the Big Dipper is circumpolar: rather than rising and setting it circles Polaris once a day, so all seven stars stay above the horizon every hour of every night of the year. That is true as geometry and not always as eyesight, because the star at the tip of the handle skims within about two degrees of the horizon at its lowest, and any tree line will swallow it.
Why this time of year
October evenings are the low point of the whole yearly circuit. Computed for Sudbury at 42.38 degrees north, Dubhe, the bright star at the lip of the bowl, stands about 15 degrees above the horizon at 9pm in mid-October, against about 21 in September, 24 in December and about 70 in May. EarthSky says the same thing in words, calling the Dipper tough to spot on late September and October evenings because it rides so low in the north, so this is the month to learn where it hides rather than the month it looks its best.
How to notice it
- After dark, face north and find the seven stars of the Dipper low down. In October you are looking not far above the rooftops, so you want the most open northern view you can get to.
- Take the two outer stars of the bowl, Dubhe and Merak, and run a line out through them away from the bowl. It lands on Polaris, and it does that at every hour and in every season.
- Note how high the bowl sits tonight against something fixed, a roofline or a particular tree. That is your mark.
- Come back to the same spot in April or May and look again. The Dipper will be riding high overhead instead, and Polaris will not have moved at all.
Try this with kids: Find the two stars on the outside edge of the Dipper's bowl and follow them to Polaris. Come back in the spring: which one of them has moved, and which one has not?
circumpolar means close enough to the north celestial pole that a star circles it all night without ever dropping below the horizon
Sources
- simbad.cds.unistra.frSIMBAD, Centre de Donnees astronomiques de Strasbourg. Alkaid, eta Ursae Majoris, declination +49 18 47.76 ICRS J2000. Queried directly on 2026-09-13 for all seven Dipper stars; Alkaid is the southernmost of the seven, and the other six run from Phecda at +53 41 41 up to Dubhe at +61 45 04. This is the independent basis for every number on this card, and it is here because the three EarthSky pages below are one publisher.
- earthsky.orgEarthSky. That at 41 degrees north latitude and farther north the Big Dipper is circumpolar, with Alkaid, the handle-tip star, as the southernmost star setting the threshold. See notes: the 41 figure is a rounding and the card does not repeat it as an exact boundary.
- earthsky.orgEarthSky. The spring-up-and-fall-down seasonal pattern, high in the evening sky in spring and low near the horizon on autumn evenings, and the specific line that the Dipper is tough to spot on late September and October evenings because it rides so low in the north. Note this page restates the same 41 degree figure as the page above; it is one claim stated twice, not two sources.
- earthsky.orgEarthSky. That Dubhe and Merak, the two outermost stars in the bowl, form a line that points to Polaris regardless of time of night or time of year.
Checked against these sources on September 13, 2026.