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The General Catalogue of Variable Stars (GCVS) is a list of variable stars in the Milky Way Galaxy [a]. Its first edition, containing 10,820 stars, was published in 1948 by the Academy of Sciences of the USSR, edited by Boris Kukarkin and Pavel Parenago. [1] Second and third editions were published in 1958 and 1968.
Schools are listed by country and by state or province. Within each geographic division, primary and secondary schools are listed first; colleges and universities are listed second. Any of the thousands of commercial or unaccredited ventures that offer online courses should be listed elsewhere, under their relevant categories.
As of 2017, there are over 52,011 known variable stars, [1] with more being discovered regularly, so a complete list of every single variable is impossible at this place (cf. GCVS). The following is a list of variable stars that are well-known, bright, significant, or otherwise interesting.
The Distance Education Accrediting Commission is the primary accrediting body that recognizes online schools, but not all schools on this list are accredited by that agency. During the COVID-19 pandemic, many of the colleges and universities in the United States offered classes entirely online, particularly facilitated via Zoom. [2]
GCVS code [2] GCVS definition [2] Standard stars SRa semi-regular variable giants of late spectral classes (M, C and S), which retain periodicity with comparative stability and possess, as a rule, small (less than 2 m.5) light-variation amplitudes. Amplitudes and forms of light curves are usually liable to strong variations from period to period.
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The General Catalogue of Variable Stars (GCVS) categorises γ Cassiopeiae stars as eruptive variables and describes them as rapidly-rotating B class giants or subgiants, although many of them are main sequence stars. It distinguishes them from those Be stars that only show smaller amplitude brightness variations.
An online school (virtual school, e-school, or cyber-school) teaches students entirely or primarily online or through the Internet. Online education exists all around the world and is used for all levels of education (K-12 High school/secondary school, college, or graduate school). Virtual education is becoming increasingly used worldwide.