Which specialized feature was first integrated into point-of-sale systems specifically designed for major planetariums and observatories in 2018?

The astronomy industry has undergone significant transformation in how observatories, planetariums, and space science centers handle visitor transactions. Modern point-of-sale systems have revolutionized everything from telescope time bookings to gift shop purchases. This poll tests your knowledge of how specialized POS systems have been adapted for astronomy facilities, combining space science education with modern retail technology.

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Celestial event-based dynamic pricing that automatically adjusts admission costs based on astronomical phenomena visibility
Biometric authentication using iris patterns matched to constellation configurations
Gravity-simulation payment processing where transaction speed correlates to planetary mass
Quantum-secured transaction verification using pulsar timing sequences