HEATKEYS

Moonstick Co. is the designer and manufacturer of manual visual calculators for astronomy, timekeeping, and computation

Best free software available all over the web. The free software categories include Windows Software, iPhone Applications, Social Networking Tools, and software installation videos.

HFLINK is the HF Automatic Link Establishment international resource for ALE High Frequency Communications, HF Digital Messaging, Emergency / Disaster Relief, Interoperative HF Communications, HF Network, Ham Radio.

Digital Photography Review: All the latest digital camera reviews and digital imaging news. Lively discussion forums. Vast samples galleries and the largest database of digital camera specifications.

Stargazing Network provide free Web page hosting for the Amateur Astronomy Community. Stargazing Network is sponsored by Cetus Technology at www.cetus.net.

martybugs.net

This site includes lots of information that is time and date related, such as yearly and monthly calendars, countdown counters and the world clock which shows current time in cities all over the world.

provides a portable circular slide-rule device for computing the time of sunrise or sunset at any location on Earth on any day of the year

The NOAA Earth System Research Laboratory was formed to observe and understand the Earth system and to develop products, through a commitment to research that will advance the National Oceanic and Atmopsheric Administration