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Astronomy and Space Technology
 Aphelion  A point in the orbit where a planet is at farthest distance from Sun (closest - Perihelion)  
 Apogee  A point in the orbit of a Earth based satellite at farthest distance from Earth (closest - Perigee)  
 BCRS  Barycentric Celestial Reference System (Geocentric - GCRS)
 CCD  Charged coupled Devices ( CCD Details
 CEO  Celestial Ephemeris Origin
 CEP  Celestial Ephemeris Pole
 CIP  Celestial Intermediate Pole
 CME  Coronal Mass Ejection (solar flares ejected from corona of the sun)  
 DSN  Deep Space Network
 EHT  Event Horizon Telescope (array of telescopes that uses VLBI for observation)  
 EMR  Electromagnetic Radiation
 ERA  Earth Rotation Angle (66.5° measured from plane of rotation around the Sun)
 EUV  Extreme Ultra Violet (solar radiation)  
 FoV  Field of View (in a telescope)  
 FRB  Fast Radio Burst (millisecond-duration radio pulses)  
 GAST  Greenwich Apparent Sidereal Time
 GCR  Galactic Cosmic Radiation  
 GCRS  Geocentric Celestial Reference System (Barycentric - BCRS)
 GIC  Geomagnetic Induced Currents
 GLE  Ground Level Event
 GHA  Greenwich Hour Angle
 GMST  Greenwich Mean Sidereal Time
 GRB  Gamma Ray Burst (solar activity)
 HET  Hobby - Eberly Telescope
 HMI  Helioseismic and Magnetic Imager (improved version of MDI used for solar activity image analysis)
 HSS  High Speed Solar wind stream  
 HST  Hubble Space Telescope  
 HUT  Hopkins Ultraviolet Telescope  
 IAU  International Astronomical Union  
 IMF  Interplanetary Magnetic Field  
 KBO  Kuiper Belt Objects  
 LASCO  Large Angle and Spectrometric COronagraph  
 LBT  Large Binocular Telescope (optical telescope)  
 LMC  Large Magellanic Cloud (small - SMC)  
 LUF  Lowest Usable Frequency  
 LWIR  Long-Wave Infra Red (short - SWIR)  
 MDI  Michelson Doppler Imager (improved version - HMI)
 MGRS  Military Grid Reference System  
 MMT  Multiple Mirror Telescope  
 MODIS  Moderate Resolution Imaging Spectroradiometer  
 MUF  Maximum Usable Frequency  
 MWIR  Mid-Wave Infra Red (short - SWIR, long - LWIR)  
 NASA  National Aeronautics and Space Administration (USA)  
 NEA  Near Earth Asteroid  
 NEAR  Near Earth Asteroid Rendezvous  
 NEO  Near Earth Object
 NGC  New General Catalogue - astronomical catalogue of nebulae, stars
 NGSC  NOAO Gemini Science Center  
 NICMOS    Near Infrared Camera and Multi-Object Spectrometer  
 NOAO    National Optical Astronomy Observatory (USA)  
 OTA  Optical Tube Assembly (telescope)
 PCA  Polar Cap Absorption event
 Perigee  A point in the orbit of a Earth based satellite at nearest distance from Earth (farthest - Apogee)  
 Perihelion  A point in the orbit where a planet is at closest distance to Sun (farthest - Aphelion)  
 PMT  Photo Multiplier Tube  
 QSO    Quasi Stellar Object (quasar)  
 RNGC  Revised NGC
 SDO  Solar Dynamics Observatory
 SED  Spectral Energy Distribution  
 SEP  Solar Energetic Particles  
 SETI  Search for ExtraTerrestrial Intelligence  
 SIRTF  Space Infrared Telescope Facility  
 SMC  Small Magellanic Cloud (large - LMC)  
 SMF  Solar Magnetic Field 
 SOAR  Southern Astrophysical Research Telescope (Cerro Pachon, Chile)  
 SOHO  Solar and Heliospheric Observatory  
 SPAN  Space Physics Analysis Network  
 SST  Spitzer Space Telescope
 STEVE  Strong Thermal Emission Velocity Enhancement
 SWIR  Short-Wave Infra Red (long - LWIR)  
 TCB Barycentric Coordinate Time
 TCG Geocentric Coordinate Time
 UBV  Ultraviolet, Blue, Visual (a photometric system to classify stars based on the colors emitted)  
 UBVRI    Ultraviolet, Blue, Visual, Red and Infrared (filters)  
 UPS    Universal Polar Stereographic (other earth surface grid used in military/GPS mapping - UTM)  
 VLBA  Very Long Baseline Array (a set of ten radio telescopes)  
 VLBI  Very Long Baseline Interferometry (technique used in EHT)  
 VLT  Very Large Telescope  
 VIS-NIR  Visible-Near Infra Red  


   Reference:
   1. Defense, Space and Astronomical Terms
   2. Frequency And Electromagnetic Spectrum
   3. NASA - Astronomy Picture of The Day
   4. NOAA - Space Weather (Aurora Borealis)
   5. GEOS - Image Viewer
  6. Date Time Reference
  7. Large Number Designation


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