Most HP 49G clocks are not very accurate. One second a day may not seem to be much, but will sum up to a minute in two months. Additionally, the temperature of the HP 49G, and therefore the usage of the calculator, influences the clock speed. ClckAdjst is a library, which provides tools for "automatic" clock adjustments and much more. ClckAdjst provides fast and easy setting and adjustment of the system clock. It handles changes of the time zone and automatic daylight saving time changes for USA and Europe. It provides an accurate "automatic" clock adjustment and shows the daily deviation of your HP 49G/g+ clock.
Sun and moon program. For the sun, calculates sunrise and sunset, coordinates, and sun compass. For the moon, calculates culmination coordinates, phase, and distance to the earth. System RPL and User RPL versions included.