Science and Mathematics

Observational Astronomy

• Heaven's Above — satellites and natural objects visible tonight and this week
• Neave Planetarium — a planetarium in your browser! (Flash & Javascript required)
• Sun & Moon Rise / Set Times — One Day One Year (USNO) — for Fort Wayne, IN:
  • Sun Rise and Set
  • Moon Rise and Set
• A Solar System Scale Model Meta Page
• Adler Planetarium ◊ Night and Day blog
• Aurora Sky Station — a live (still) camera located at 68.2N, 18.4E (STF Abisko Mountain Station, Sweden)

Space Missions

In Development

• James Webb Space Telescope (Hubble follow-on) • Building 29 clean-room webcam

Ongoing

• ACE — Advanced Composition Explorer
• Herschel Space Observatory (ESA) • NASA • CalTech
• Planck (ESA) • Spacecraft Ops • Science Team
• SOHO — Solar and Heliospheric Observatory
• WMAP — Wilkinson Microwave Anisotropy Probe

Completed

• Genesis "Search for Origins"

Earth Observations

• MODIS Mission • IOTD • Rapidfire • Rapidfire Image Gallery • MODIS Today

Cool videos

• What if Earth had rings like Saturn
• The Known Universe — scaling out from the Himalayas to the fringes of the observable universe
• The Geostationary Highway

Reference Data

• NIST Reference on Constants, Units, and Uncertainties
• The Photographic Periodic Table – The Wooden Periodic Table

DIY Experiments

• Cellphone Spectrometer

Geoid

• GOCE High Precision Geoid

Earthquakes and Tectonics

• USGS – Recent Earthquakes

General Reference

• Wolfram's MathWorld — the web's most extensive mathematical resource, from Wolfram Research, makers of Mathematica.
• Handbook of Mathematical Functions (also contains physical constants; sadly, actual function value tables are omitted)
• NIST's Digital Library of Mathematical Functions (an update to the original Handbook above)

Logics

• Introduction to Logic

Various Topics

• Back-of-the-Envelope "pages about approximation", includes "a million dots on one page"

Open Source Software

• The R Project for Statistical Computing
• ROOT: A Data Processing Framework

Online Calculators, Evaluators, Solvers, and Generators

• Sage — Open Source Mathematics Software (some features also provided online)
• Quick Math — an online calculator that solves equations and does all sorts of algebra and calculus problems
• Online Prime Factorization (9 digits)
• Online Prime Factorization (9.5 digits)

Constants, Symbols, and Notation

• Table of Mathematical Symbols
• Mathematical Constants, to 50 decimal places
• Pi to 1,000,000 places (the actual page within that site keeps moving)
• Notation for intervals