Based on TLE data, using the SGP4 orbit model for space object Moon shadow (eclipse) time calculation, Moon shadow includes umbra and penumbra.

Umbra: The region where sunlight from any point on the Sun cannot reach.

Penumbra: The region where part of the sunlight cannot reach. Time output uses UTC time format.

Billing Mode:

Annual package mode is a prepaid mode, where payment is made before usage, and settlement is based on the purchase cycle of the order. Therefore, before purchasing, you must ensure that the account balance is sufficient.

Pay-as-you-go mode is an instant consumption mode, where the interface is called in real-time and the account balance is consumed in real-time, at a rate of 0.005 yuan per call. When the account balance is insufficient, the interface call will fail. Please ensure that the account balance is sufficient.

Renewal:

Annual package service will affect the normal invocation of the algorithm after expiration. If you wish to continue using the Moon shadow algorithm, please renew as soon as possible. Renewal includes two methods: manual renewal and automatic renewal. You can choose based on your needs. To learn more about renewal requirements, please refer to Renewal Overview