Subject
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- nebeská mechanika1
- nonradial oscillations1
- nuclear physics1
- old prints1
- onboard computation system1
- open star clusters1
- optical flashes1
- optical spectrophotometry1
- optics1
- orbital elements of streams1
- orbiting around Mars1
- orloje1
- our galaxy1
- outflows1
- panel discussion1
- pendulum1
- periodic comets1
- philosophy1
- photography1
- pre-perihelion photometry1