Can you see the Milky Way from Philadelphia?

Not from Philadelphia itself — at about Bortle 9 the dome is too bright. The darkest edge of the same metro is Landenberg, about 34 mi out at roughly Bortle 4, or drive to the certified Cherry Springs State Park (180 mi) for a genuinely dark sky.

How dark is the sky across the Philadelphia metro?

It varies by how close you are to the core. Philadelphia itself reads about Bortle 9; the 70 towns in this light dome range down to Landenberg at roughly Bortle 4, about 34 mi from the core. The table above sorts every town in the metro by measured darkness.

Where's the nearest certified dark-sky destination to Philadelphia?

Cherry Springs State Park (Dark Sky Park), about 180 mi away.

Philadelphia, PA — light pollution & stargazing across the metro

Pennsylvania · Very poor — city glow · 70 towns · 3,301,956 people in this light dome

The Philadelphia, PA light dome covers 70 towns and about 3,301,956 people rated together, reading roughly Bortle 9 — a inner-city sky (very poor — city glow) — at Philadelphia itself, measured from VIIRS 2024 satellite night-lights. The darkest edge of this same dome is Landenberg, about 34 mi out, at roughly Bortle 4. The nearest certified dark-sky destination is Cherry Springs State Park, about 180 mi away. Tonight's Moon phase, cloud cover, and aurora odds load live below, computed in your browser.

1–2 3 4 5 6 7 8 9

← darker sky You: Bortle 9 · Inner-city sky brighter →

Stargazing at the Philadelphia core tonight

Light-pollution reading — dome core Philadelphia, PA · VIIRS 2024

Estimated Bortle class (core): 9 of 9
VIIRS radiance (core): 223 nW/cm²/sr
Naked-eye limiting mag. (core): under 4.1
Darkest edge of this dome: Landenberg · B4 · 34 mi

What you can see from the Philadelphia core

Only the Moon, the bright planets, and a scattering of the very brightest stars pierce the glow. For real stargazing you'll want to drive to a darker site.

At an estimated Bortle 9, the faintest stars visible from Philadelphia itself on a clear, moonless night run to about magnitude 4.0 or brighter, and the Milky Way is not visible. Landenberg is a regional drive away (34 mi) and improves to roughly Bortle 4.

Of the 70 towns rated in this dome, most read Bortle 7 (34 towns) — spread across 6 darkness classes overall. Beyond Philadelphia itself, Trenton, Camden, Wilmington round out the largest towns sharing this same light dome.

The sky from 40.0°N

Declination above +50.0° never sets here, and below −50.0° never rises — no matter how clear the night or how long you wait.

Never sets: Polaris, the Big Dipper
Never rises: Canopus, Alpha Centauri, the Southern Cross
Milky Way core: culminates 21.0° above the southern horizon — it climbs to a workable height in the south on summer nights.
Longest night: 14 h 50 m at the December solstice, 9 h 10 m in June.
Midsummer: the Sun reaches only 26.6° below the horizon at solar midnight in June — past the 18° astronomical-night mark.

Geometric, from 39.952°N, 75.164°W. How these are computed.

Every town in this light dome, darkest first

All 70 towns inside Philadelphia's ~35-mile dome, each with its own measured reading.

Philadelphia metro towns, darkest sky first.
Town	State	Bortle	Sky	Radiance
Landenberg	PA	4	Rural / suburban transition	1.8
Vincentown	NJ	5	Suburban sky	3.8
Jackson	NJ	5	Suburban sky	4.4
Sewell	NJ	6	Bright suburban sky	8.0
Lumberton	NJ	6	Bright suburban sky	8.4
East Norriton	PA	6	Bright suburban sky	10
Mount Laurel	NJ	6	Bright suburban sky	11
West Norriton	PA	6	Bright suburban sky	12
Pike Creek Valley	DE	6	Bright suburban sky	12
Pine Hill	NJ	6	Bright suburban sky	13
Atco	NJ	6	Bright suburban sky	14
Levittown	PA	6	Bright suburban sky	14
Limerick	PA	6	Bright suburban sky	14
Willingboro	NJ	6	Bright suburban sky	14
Hockessin	DE	6	Bright suburban sky	14
Greentree	NJ	6	Bright suburban sky	15
Springdale	NJ	6	Bright suburban sky	16
Sicklerville	NJ	6	Bright suburban sky	16
Springfield	PA	6	Bright suburban sky	16
Pennsville	NJ	6	Bright suburban sky	17
Broomall	PA	6	Bright suburban sky	17
Hamilton Square	NJ	6	Bright suburban sky	17
Moorestown-Lenola	NJ	6	Bright suburban sky	17
Lindenwold	NJ	6	Bright suburban sky	19
Haddonfield	NJ	6	Bright suburban sky	20
Havertown	PA	7	Suburban / urban transition	22
Wayne	PA	7	Suburban / urban transition	22
Hammonton	NJ	7	Suburban / urban transition	22
Cinnaminson	NJ	7	Suburban / urban transition	22
Browns Mills	NJ	7	Suburban / urban transition	23
Bear	DE	7	Suburban / urban transition	23
Ewing	NJ	7	Suburban / urban transition	24
Williamstown	NJ	7	Suburban / urban transition	24
Collingswood	NJ	7	Suburban / urban transition	24
Pottstown	PA	7	Suburban / urban transition	24
Mercerville-Hamilton Square	NJ	7	Suburban / urban transition	25
Phoenixville	PA	7	Suburban / urban transition	26
Mercerville	NJ	7	Suburban / urban transition	26
Lansdowne	PA	7	Suburban / urban transition	26
Drexel Hill	PA	7	Suburban / urban transition	27
Abington	PA	7	Suburban / urban transition	27
Horsham	PA	7	Suburban / urban transition	28
West Chester	PA	7	Suburban / urban transition	30
Maple Shade	NJ	7	Suburban / urban transition	30
Cherry Hill Mall	NJ	7	Suburban / urban transition	30
Montgomeryville	PA	7	Suburban / urban transition	31
Gloucester City	NJ	7	Suburban / urban transition	32
Bensalem	PA	7	Suburban / urban transition	32
Echelon	NJ	7	Suburban / urban transition	34
Darby	PA	7	Suburban / urban transition	35
Cherry Hill	NJ	7	Suburban / urban transition	35
Radnor	PA	7	Suburban / urban transition	36
Lansdale	PA	7	Suburban / urban transition	36
Yeadon	PA	7	Suburban / urban transition	37
Glassboro	NJ	7	Suburban / urban transition	37
Willow Grove	PA	7	Suburban / urban transition	38
Bellmawr	NJ	7	Suburban / urban transition	38
Mount Holly	NJ	7	Suburban / urban transition	39
Pennsauken	NJ	7	Suburban / urban transition	39
Ardmore	PA	8	City sky	40
Marlton	NJ	8	City sky	42
Woodbury	NJ	8	City sky	47
Vineland	NJ	8	City sky	50
Norristown	PA	8	City sky	52
Trenton	NJ	8	City sky	55
Chester	PA	8	City sky	57
Camden	NJ	8	City sky	71
King of Prussia	PA	8	City sky	75
Wilmington	DE	9	Inner-city sky	105
Philadelphia	PA	9	Inner-city sky	223

Certified dark-sky destinations near Philadelphia

Certified International Dark Sky Places within reach of Philadelphia — nearest first.
Place	Designation	Distance
Cherry Springs State Park	Dark Sky Park	180 mi

Other light domes near Philadelphia

New York City, NY (81 mi, core Bortle 9) , Baltimore, MD (90 mi, core Bortle 9) , and Washington, DC (125 mi, core Bortle 9) are the closest other metro-scale domes tracked here — each with its own core reading and its own darkest edge.

Frequently asked questions

Can you see the Milky Way from Philadelphia?: Not from Philadelphia itself — at about Bortle 9 the dome is too bright. The darkest edge of the same metro is Landenberg, about 34 mi out at roughly Bortle 4, or drive to the certified Cherry Springs State Park (180 mi) for a genuinely dark sky.
How dark is the sky across the Philadelphia metro?: It varies by how close you are to the core. Philadelphia itself reads about Bortle 9; the 70 towns in this light dome range down to Landenberg at roughly Bortle 4, about 34 mi from the core. The table above sorts every town in the metro by measured darkness.
Where's the nearest certified dark-sky destination to Philadelphia?: Cherry Springs State Park (Dark Sky Park), about 180 mi away.

How to read this rating

A satellite proxy, not a survey-grade reading. Sources and limits.

More in Pennsylvania

All Pennsylvania towns · Bortle scale · Tonight's Moon · Dark-sky map