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# Sun

## Position in the Sky

• Motions of the Sun Simulator
• Rises East --> sets West
• Depending on the time of year, we can use the altitude to calculate the Sun's position in the sky
• Maximum height when crossing the meridian at local noon
• Local noon
• Declination ranges between -23.5˚ and +23.5˚

## Composition

### Core

• Extremely dense
• Source of all its energy
• Approximately 20% of the interior
• Temperature of 15 million K
• Hottest part of the Sun

• Photons carry energy and hit particles transferring energy
• How energy goes from inside --> outside
• Light from the core is transported through this zone very slowly
• High density
• Photons encounter other particles and change direction or lose some energy

### Convective zone

• Hot blobs of gas moving out
• Outermost layer of the interior

## Energy

• Outputs about $4 \times 10^{25}$ watts of energy
• When Albert Einstein discovered that mass can be considered energy, and converted into energy, the mysteries behind the Sun's power were unlocked