Inside Sejong Observatory: a 5 m (16 ft) dome and 30 seats, projector Goto EX3. Rows of seats are drawn from the seat count and the dome from its diameter.

Planetarium · Yeoju, Gyeonggi-do, South Korea

Sejong Observatory

Sejong Observatory is a planetarium in Yeoju, Gyeonggi-do, South Korea. Sejong Observatory has a 5 m (16 ft) dome and 30 seats.

Sejong Observatory in brief

Public shows
Not for the general public
Dome
5.0 m
Seats
30
Projector
Goto EX3
Bortle class outside
Not yet rated

Public shows at Sejong Observatory: Not for the general public

Private observatory with small planetarium; public observing programs and camps.

472-2 Bupyeong-ri, Gangcheon-myeon, Yeoju, Gyeonggi-do, South Korea. Phone +82 31-886-2200.

Sejong Observatory has a 5 m (16 ft) dome and 30 seats

That makes it a small dome, typical of schools, colleges and portable shows. The largest planetarium domes in the world are about 35 m across; a classroom dome is 5 to 8 m.

Its star projector is the Goto EX3, an optical instrument that shines pinpoint stars through a ball of lenses, the classic planetarium sky.

How dark the real sky is outside Sejong Observatory

Sejong Observatory has no Bortle rating in the list yet. The scale below shows what each class looks like.

1 mag 8.0 21.99+ 2 mag 7.5 21.89+ 3 mag 7.0 21.69+ 4 mag 6.5 20.49+ 5 mag 6.0 19.50+ 6 mag 5.5 18.94+ 7 mag 5.0 18.38+ 8 mag 4.5 18.00+ 9 mag 4.0
The Bortle scale. Each panel shows the class number, the faintest star the naked eye reaches at the zenith, and the darkest-edge sky brightness reading of that class in mag/arcsec².

Sky brightness and class come from the World Atlas of Artificial Night Sky Brightness (Falchi et al. 2016, CC BY-NC 4.0), with natural skyglow added, at the coordinates below. Planetariums sit in towns, so the dome shows the sky the street outside cannot; the dark sky places nearby show the real one.

Sejong Observatory among the planetariums of South Korea

Yeongyang Firefly Eco Park Bohyunsan Optical Astronomy Observatory Sobaeksan Optical Astronomy Observatory Jo Kyeong-chul Astronomical Observatory Pocheon Art Valley Astronomical Science Museum Seoul National University Planetarium Seogwipo Astronomical Science and Culture Center Bucheon Hanulbit Library - Fantasia Bucheon Planetarium Songam Space Center (Songam Observatory) Boseong Astronomical Science Museum Daejeon Citizen Observatory Gimhae Astronomical Observatory Gwangju Creative Convergence Education Institute (formerly Gwangju Education and Science Research Institute) Jeonbuk Institute of Science Education Jeonnam Creative Convergence Education Institute (formerly Jeollanamdo Institute of Science Education) Gangwon-do Educational & Science Research Institute Ourstar - Astronomers' Village (Cheonmunin Maeul) Namwon Aerospace Observatory Starpark - Chilgapsan Observatory Goheung Space Astronomy Science Museum Gokseong Seomjin River Observatory Jeju Starlight World Park and Planetarium Jwagusan Observatory Gyeonggi Institute of Science Education - North Branch Chungcheongbuk-do Natural Science Education Institute Cheonan Hong Dae-yong Science Museum Cheongju Land - Galileo Planetarium Jeju Education and Science Research Institute National Center Observatory (Gukto Jeongjungang Cheonmundae) Changwon Science Center Daegu Education & Science Research Institute Gimcheon Science Museum Gyeonggi Institute of Science Education Gyeongsangnam-do Office of Education Science Education Institute Chungju Goguryeo Astronomy Science Museum Gyeongsangbuk-do Office of Education Science Institute Gumi Science Center Incheon Education and Science Information Institute Jeongnamjin Astronomical Science Museum Yecheon Astro-Space Center Seosan Ryu Bang-taek Astronomical Meteorological Science Museum National Science Museum (Daejeon) Gwacheon National Science Museum Space 360 Gwangju National Science Museum Nowon Cosmos Science Center (former Seoul English Science Edu Center) National Children's Science Center (former National Science Museum Seoul) Seoul Science Park (Seoul Science Exhibition Center) Bohyunsan Astronomical Science Museum Naro Space Center Space Science Museum National Youth Space Center Taean Shooting Star Sky Park Anseong Machum Astronomical Science Museum Busan Science Education Institute (Busan Office of Education) Daegu National Science Museum Yeongyang Firefly Observatory Gunpo Nuri Observatory Jeju Aerospace Museum (JAM) Busan National Science Museum Ulsan Science Museum Byeolmaro Observatory Seonhak Byeolbit Library Yangpyeong International Observatory Sejong Observatory Yeoju, Gyeonggi-do, South Korea Sejong Observatory Yeoju, Gyeonggi-do, South Korea
Dark sky place Observatory open to the public Planetarium

Pink dots are planetariums, green dots observatories open to the public, squares dark sky places and diamonds star parties; select one for its page. See Planetariums in South Korea for the full list.

The coordinates on this page point to Yeoju city center (approximate): 37.298°N, 127.637°E.

Map data © OpenStreetMap contributors. Open the larger map · Directions.

Dark sky places, observatories and clubs near Sejong Observatory

Nearest dark sky places

PlaceWhereBortleDistance
Yeongyang Firefly Eco ParkYeongyang, South Korea3147 km (91 mi)

Observatories open to the public within 150 km

Astronomy clubs within 150 km

Other planetariums within 150 km

Sejong Observatory record

Every value in the planetariums dataset for Sejong Observatory
ID1669
NameSejong Observatory
Address472-2 Bupyeong-ri, Gangcheon-myeon
CityStateYeoju, Gyeonggi-do
CountrySouth Korea
Phone+82 31-886-2200
Image2494.jpg
Dome5
Seats30
OpticalGoto EX3
Lat37.29800
Lon127.63700
LatLonSpotYeoju city center (approximate)
StatusOpen
PublicNotePrivate observatory with small planetarium; public observing programs and camps
Sourceshttps://astro.kasi.re.kr/learning/pageView/5767; https://ggtour.or.kr/travel-info/tourism-info/725c3a64-746a-11ee-b910-0242ac120002

From the site's planetariums dataset (planetariumsglobal_q426). Distances are computed from the coordinates.