- Astronomical Constants from NASA - http://www.ksc.nasa.gov/facts/faq04.html
- Contains astronomical/space constants and equations.
- RefScout - http://www.refscout.com/
- A weekly, scientific reference mailing service.
- Physics and Science Reference by PhysLINK.com - http://www.physlink.com/reference/index.cfm
- Includes physical constants, online unit conversions, periodic table of elements, exact time, fundamental physical formulae and equations.
- Beta-Theta - http://www.beta-theta.com/
- Gives general defintions, background and examples from the science fields of biology, physics, chemistry, math, and history. Includes forum boards.
- The Constants and Equations Pages - http://www.scenta.co.uk/tcaep/
- Expands reference resources for science, maths, and astronomy.
- DOE Community - http://www.osti.gov/doecommunity/
- Searchable database for reports that are generated by federally funded projects.
- Science and Engineering Encyclopedia - http://www.diracdelta.co.uk
- Descriptions, equations, calculators, conversions and material data for engineering, mathematics, physics and chemistry.
- CalcTool - http://www.calctool.org/
- Directory of simply-presented javascript calculators and equations for making common calculations. Provides quick, simple online calculation and unit conversion tools.
- Eformulae.com - http://www.eformulae.com
- Online resource providing engineering, science, math, physics and chemistry formulae for reference.
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