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The fourth millennium of the Gregorian calendar will begin on January 1, 3001, and end on December 31, 4000.
- 3000: Sea level was predicted to rise by between 1.1 and 6.8 meters (4 and 22 ft) by the year 3000 in a 2012 study.
- 3015: A camera placed by Jonathon Keats will finish its exposure time after its placement at the ASU Art Museum in Tempe, Arizona, in 2015.
- 3117: Minimum time by which, according to physicist Andrew Kennedy, humanity can expect to have reached Barnard's Star, assuming an annual economic growth rate (and corresponding increase in power output) of 1.4% from 2007.
- 3183: The time pyramid, a public art work at Wemding, Germany, is scheduled for completion.
- c.3000: Due to axial precession, γ Cephei will replace the previous target, Polaris (α Ursae Minoris), as Earth's northern pole star (the next naked eye North star will be ι Cephei, c.5200).
- December 18, 3089: First transit of Venus which is not part of a pair since November 23, 1396.
- December 20, 3332: Transit of Venus.
- 3412: Expected return of Comet McNaught–Russell.
- 3711/12: Multi-triple conjunction between Jupiter, Saturn, Uranus and Neptune.
- The expected return of Comet Donati.
- H Goelzer, P Huybrechts, S C B Raper, M-F Loutre, H Goosse, T Fichefet. Millennial total sea-level commitments projected with the Earth system model of intermediate complexity LOVECLIM. Environmental Research Letters, 2012; 7 (4): 045401, doi:10.1088/1748-9326/7/4/045401. "The research showed that we have already committed ourselves to a sea-level rise of 1.1 metres by the year 3000 as a result of our greenhouse gas emissions up to now. This irreversible damage could be worse, depending on the route we take to mitigating our emissions. If we were to follow the high A2 emissions scenario adopted by the Intergovernmental Panel on Climate Change (IPCC), a sea-level rise of 6.8 metres could be expected in the next thousand years. The two other IPCC scenarios analysed by the researchers, the B1 and A1B scenarios, yielded sea-level rises of 2.1 and 4.1 metres respectively." "Irreversible Warming Will Cause Sea Levels to Rise for Thousands of Years to Come, New Research Shows". Science Daily.
- "This Camera Will Capture a 1,000-Year Exposure That Ends in 3015 for History's Slowest Photo". PetaPixel. Retrieved 2015-12-14.
- Kennedy, Andrew (July 2006). "Interstellar Travel: The Wait Calculation and the Incentive Trap of Progress". Journal of the British Interplanetary Society (JBIS). 59 (7): 239–246.
- Conception Official Zeitpyramide website, accessed: 14 December 2010