- Mirfak (stars.astro.illinois.edu)
MIRFAK (Alpha Persei). Perseus, the ancient hero who rescued Andromeda, climbs the northeastern sky in northern autumn evenings, bright Mirfak marking his side amidst a lovely stream of stars that lies within the northern-hemisphere autumn Milky Way.
- Piano (Wikipedia)
The piano is a keyboard instrument that produces sound when pressed on the keys. Most modern pianos have a row of 88 black and white keys: 52 white keys for the notes of the C major scale (C, D, E, F, G, A, and B) and 36 shorter black keys raised above the white keys and set further back, for sharps and flats. This means that the piano can play 88 different pitches (or “notes”), spanning a range of a bit over seven octaves. The black keys are for the “accidentals” (F♯/G♭, G♯/A♭, A♯/B♭, C♯/D♭, and D♯/E♭), which are needed to play in all twelve keys.