light hour - the distance light travels in a vacuum in one hour; approximately one billion kilometers. astronomy unit - a linear unit used for astronomical distances. light year, light-year - the distance that light travels in a vacuum in 1 year; 5.88 trillion miles or 9.46 trillion kilometers.
Do you have a question about Keystone Health or our services? You may contact our practices by using the phone numbers found at the right or by calling the Keystone Health administrative office at (717) 709-7900. Our fax number is (717) 709-7925. PLEASE NOTE: This is the fax to our administrative office.
Toll free business telephone assistance is available at 1-800-829-4933. The hours of operation for this number are also 7 am to 7 pm local time. Businesses that require assistance with E-services can contact the E-help Desk Monday-Friday from 6:30 am to 6:00 pm central standard time. The E-help Desk is staffed with IRS tax professionals who can typically handle inquiries involving E-services products. The toll-free number for this is 1-866-255-0654.