SDTV and high definition television (HDTV) are the two categories of display formats for digital television (DTV) transmissions, which are becoming the standard. In North America, digital SDTV is broadcast in the same 4:3 aspect ratio as NTSC signals with widescreen content being center cut.
Command pilot Neil Armstrong 's flight marked the second time a U.S. civilian flew into space (Joseph Albert Walker became the first U.S. civilian on X-15 Flight 90). Armstrong had resigned his commission in the United States Naval Reserve in 1960.
Accomplishments. he was the first man on the moon. He has flown over 200 different aircrafts. He has gotten the Presidential Medal of Freedom. No one knows why. He was a professor of aerospace engineering. He received a Bachelor of Science degree in aeronautical engineering. Main accomplishment is first human on the moon. Neil is still alive and is 81. How Neil Armstrong spent his later life. Neil Armstrong worked for NASA. After NASA he worked as a professor of aerospace engineering. Then he was chairman of the computing technology for aviation Inc. Next he received a Bachelor of Science degree in aeronautical engineering.