We present the outreach activities of Kirdkao Observatory in Kanchanaburi, Thailand, and of the Learning Center for Earth Sciences and Astronomy (LESA) in Thailand during 2006-2010. The goal of LESA is to apply the research-based learning approach to complement astronomy education, which has been included in the national curriculum since 2002, and to let secondary school students gain first-hand experience in astronomical research. Realization of research-based astronomical education in Thailand has long been held back by the limited availability of astronomical facilities in the country. Two major difficulties we have overcame in developing these modules are, first, to seek research topics that are meaningful, inspiring, and can demonstrate the process of astronomical research with minimal background, and second, to find the software capable of processing large amounts of astronomical data, yet accessible for students. We have developed learning modules for students using real-life data that centered on the basic methods in observational astronomy, including astrometry, photometry, and spectroscopy. In each of the past five years, LESA organized workshops for students to carry out research projects using these modules and present their works at our annual meetings. Examples of student projects are the search for variable stars and minor planets, supernovae, and spectroscopic study of stars and galaxies. To date, more than 80 students from 25 schools have participated in our workshops. Our results demonstrate the feasibility of adapt-ing astronomical data or remotely available telescopes to carry out research-based education, despite the lack of locally available astronomical infrastructures.