First Day of Spring 2011 Calendar and Astronomical Facts
The first day of spring 2011 was March 20, 2011, the March equinox, when the Sun crossed the celestial equator moving northward. The United States Naval Observatory and similar astronomical agencies publish these equinox and solstice dates as standard reference data for civil and scientific use USNO equinox data.
In the Northern Hemisphere, the March equinox marks the start of astronomical spring, while meteorological spring begins on March 1. The exact moment of the 2011 equinox occurred at 23:21 UTC on March 20, corresponding to late afternoon in much of the Americas and evening in Europe and Africa.
Financial Markets and Economic Releases on March 20, 2011
On the first day of spring 2011, major U.S. equity exchanges such as the NYSE and NASDAQ opened for regular trading under standard hours, with investors reacting to ongoing concerns about the Fukushima nuclear incident, the Arab Spring, and global commodity prices Forbes market volatility.
The U.S. Labor Department released weekly initial jobless claims data on March 20, 2011, while the Federal Reserve's Beige Book and other regional reports provided snapshots of economic activity. The S&P 500, Dow Jones Industrial Average, and NASDAQ Composite moved within a range shaped by energy prices, the yen's strength, and safe-haven flows into Treasuries SEC market data.
Climate and Energy Context for the First Day of Spring 2011
NOAA and NASA reported that March 2011 was part of a period of elevated global temperatures, with the first day of spring 2011 following one of the warmest winters on record in many regions. The National Climatic Data Center archived temperature and precipitation anomalies for March 20, 2011, useful for agriculture, energy demand forecasting, and long-term climate comparisons NOAA climate data.
Energy markets tracked heating degree day transitions as the Northern Hemisphere moved toward spring, with natural gas and crude oil futures responding to inventory data and geopolitical risk premiums. Companies such as Tesla, which later became a major EV and energy storage player, were in early stages of development, while SpaceX prepared for its first commercial launch contracts that would reshape the aerospace sector Tesla historical data.