He was Acting Curator of Airdrie Public Observatory in 1979–80 and was Assistant Curator between 1987 and 1997, becoming a curator again in 2002 and continuing to 2008. ASTRA ceased to run the Observatory for North Lanarkshire District Council in May 2009, ceding the running of the Observatory to the Airdrie Astronomical Association (A.A.A). In 2006 and 2007 Lunan ran astronomy education projects funded by the National Lottery's "Awards for All", with outreach to schools and community groups, followed by a larger project funded by Heritage Lottery for 2007–2008. His monthly astronomy column "The Sky above You" has appeared in various newspapers and magazines.