M33 is a difficult object, even with averted vision. Only well above the horizon does the MW reveal any Some light pollution eveidnet along the horizon. Zodical light is striking in Spring and Autumn, extending 60Īirglow is not visible and clouds are faintly illuminated, MW still appears complex, dark voids and bright patches andīrightest Globular Clusters are distinct, but M33 is only Ground is mostly dark, but objects projecting into the sky are Zodiacal light bright enough to cast weak shadows after dusk andĪirglow may be weakly apparent and clouds still appear as dark M33 is visible with direct vision, as are many globular Summer MW shouws great detail and has veined appearance. Ground objects are barely lit and trees and Light has an obvious color and can stretch across the entire sky.Īirglow is visible near the horizon and clouds appear as dark blobs againtīrightness of Jupiter and Venus is annoying to night vision. Great detail and light from the Scorpio / Sagittarius region casts obvious In other words,Ī magnitude 5 star appears approximately two and one-half times brighter than a magnitude 6 star, while a magnitude 4 star appears approximately five times brighter than a magnitude 6 star. Each whole number represents a factor of 2.51 in brightness. The larger the magnitude number is, the dimmer the star is. The column labeled "Naked-eye Limiting Magnitude" indicates the dimmest stars visible under each class of light pollution. Use the chart below with the Light Pollution maps to guage the quality of your night skies where you live.
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