Detwiler Planetarium

Lycoming College, 700 College Place
Williamsport, PA 17701


The College's Detwiler Planetarium is used in our astronomy classes, and astronomy majors can be trained to operate it to give shows to outside groups. Currently, the planetarium has a 30 foot dome with optical-mechanical star projector. Plans are in the works for a totally new planetarium which will be a optical-mechanics/digital hybrid projector. Some of our astronomy majors go on to operate planetariums in a variety of settings after graduation. Additionally, the department has several portable optical telescopes that students frequently set up on campus and may also take off campus for better observing conditions. Along with our astronomy program, we also have a geology laboratory with rock, mineral, and fossil samples collected from all over the country.

Images provided by, Ticketmaster
Please use "Flag This Place" to alert us about content that is inappropriate or needs immediate attention. Nothing you submit will be shared with other site visitors.

Upcoming AARP Events

View All AARP Events »

Find information about getting a COVID-19 vaccine in your state. CDC information is available at; additional AARP information and resources are at En español, visite

AARP Member Card

Join or Renew Today


  • Immediate access to your member benefits
  • Discounts on travel and everyday savings
  • Subscription to the award-winning AARP The Magazine
  • An ally on the issues that matter most to you in Williamsport
  • Free membership for your spouse or partner