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AgainErick CC BY-SA 4.0 Wikimedia Commons

Chankillo Archaeoastronomical Complex

Historical Site

Chankillo in Ancash features thirteen aligned towers forming a solar observatory and associated fortifications; visitors study prehispanic astronomy, walk the coastal desert ruins and visit the small onsite museum.

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In this guide

Chankillo Archaeoastronomical Complex essentials

Address: Chankillo Archaeoastronomical Complex, Casma Province, Ancash Region, Peru
Website: mincetur.gob.pe (Peruvian tourism
Hours: Daylight hours; archaeological site open generally from early morning until late afternoon (check local management for exact times).
Admission: Visitor access to the Chankillo site is low-cost; museum and site fees minimal (Peruvian soles). Guided tours recommended and inexpensive.
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About Chankillo Archaeoastronomical Complex

Chankillo is an archaeological complex on the north coast of Peru noted for an aligned sequence of thirteen towers that functioned as a solar observatory. It provides one of the earliest known large-scale horizon observatories in the Americas.

The distinctive feature is a near-linear row of 13 towers stretching along a ridge that served as a calibrated horizon marker for the rising and setting sun. Visitors also see nearby ceremonial architecture, residential areas and defensive works that together document a regional ceremonial center.

Archaeological evidence places construction and primary use of the complex in the first millennium BCE, when local societies built monumental architecture for calendrical, ceremonial and political purposes. The towers and associated structures show organized community effort and astronomical knowledge.

The site lies in the Casma Valley on Peru’s north-central coast within the Ancash region, set in an arid coastal landscape of river valleys and low hills.

  • Tower alignment and span: The thirteen towers span roughly 300 meters along the ridge and mark incremental sunrise and sunset positions across the year.
  • Age and cultural period: The complex dates to the preclassic horizon of Andean archaeology, with construction and use centered in the first millennium BCE.

What to See#

  • Thirteen Towers (solar observation line): A line of thirteen stone towers aligned along a ridge that served as a solar horizon observatory, used to track the sun’s rising and setting positions throughout the year.
  • Fortress and temple precincts: Associated ceremonial and residential structures including a fortified hilltop complex and temple areas that form part of the same archaeological ensemble.
Things to Do
When to Go

Best Time to Visit Chankillo Archaeoastronomical Complex

Dry season (May-September) provides the most reliable clear skies for studying the site's solar alignments.

Dry Season (May-September)
May-September · 18-28°C
Clear skies ideal for astronomical alignments and comfortable touring.
Warm Season (Oct-Apr)
October-April · 20-30°C
Warmer temperatures; some coastal humidity but still generally dry.

Weather & Climate near Chankillo Archaeoastronomical Complex

Climate

Chankillo Archaeoastronomical Complex's climate is classified as Hot Desert - Hot Desert climate with warm summers (peaking in February) and mild winters (coldest in August). Temperatures range from 13°C to 29°C. Very dry conditions with minimal rainfall with a pronounced dry season.

Air Quality: AQI 53 Moderate
Best Time to Visit
AprilJanuaryFebruary
Temperature & Rainfall
Temperature Range
33°
Warmest Month
11°
Coldest Month
Monthly Conditions
Month Comfort Temp Feels Rain Sky Humidity Wind UV Daylight
January Excellent 18° - 28° 23° 8 mm partly cloudy 73% 3.9 m/s 2.8 extreme 12.5h
February Excellent 18° - 29° 24° 10 mm partly cloudy 73% 3.6 m/s 2.8 extreme 12.3h
March Excellent 18° - 29° 23° 11 mm partly cloudy 71% 3.6 m/s 2.6 extreme 12.0h
April Ideal 17° - 27° 22° 7 mm partly cloudy 66% 3.7 m/s 2.4 extreme 11.8h
May Excellent 15° - 26° 21° 1 mm partly cloudy 63% 3.5 m/s 1.9 very high 11.6h
June Excellent 14° - 25° 19° 0 mm overcast 60% 3.2 m/s 1.5 very high 11.5h
July Excellent 14° - 24° 19° 1 mm overcast 56% 3.2 m/s 1.5 very high 11.5h
August Excellent 13° - 23° 18° 0 mm overcast 52% 3.3 m/s 1.7 very high 11.7h
September Excellent 14° - 23° 18° 1 mm overcast 53% 3.8 m/s 2.0 extreme 11.9h
October Excellent 14° - 24° 19° 2 mm overcast 58% 3.9 m/s 2.4 extreme 12.2h
November Excellent 15° - 26° 20° 3 mm partly cloudy 63% 4.0 m/s 2.6 extreme 12.4h
December Excellent 17° - 27° 22° 4 mm partly cloudy 69% 3.9 m/s 2.7 extreme 12.5h
Getting There & Around

How to Get to Chankillo Archaeoastronomical Complex

Chankillo is about a 2-3 hour drive from the regional centre of Casma or from the city of Huaraz with a longer drive; most visitors come via road from Casma or nearby towns.

Tips for Visiting Chankillo Archaeoastronomical Complex

  • Climb the Thirteen Towers early for sunrise or late afternoon - the light emphasizes the alignment and sheds harsh midday glare.
  • Bring sun protection and water; the coast is arid and shade is limited at Chankillo.
  • Pair Chankillo with a stop at the nearby museum at Casma to understand the broader pre-Columbian context.