What is the anti-solar point in SETI?
- Type
- Background entry
- Sources
- 8
The anti-solar point is a Schelling-style beacon target where an observer seeing Earth transit the Sun would transmit at the transit midpoint.
Summary
The anti-solar point is a geometrically defined SETI target created by Earth-transit geometry. Mainstream research treats it as a rational way to narrow the search across both sky position and timing: an observer who sees Earth transit the Sun might identify the transit midpoint as a salient moment for communication. The Allen Telescope Array program makes this idea experimentally testable without treating the premise as established.
- Search designThe strategy concentrates observing time on a moving position and recurring alignment rather than surveying the sky uniformly.
- Evidence standardIts value depends on detecting a localized, narrowband, Doppler-drifting signal consistent with technology.
- The anti-solar point supplies both a location and a time coordinate for a targeted technosignature search.
- The underlying rationale comes from game-theory Schelling points: independently chosen reference points that can coordinate action without communication.
- The ATA campaign searches the point repeatedly as Earth moves around the Sun.
Source mix
3 of 8 institutional
- 3 Journals & institutions
- 1 Early research (not yet peer-reviewed)
- 1 Reference & archives
- 3 Other / unclassified
Deeper Insight
The anti-solar point is a clever bet, not a cosmic rendezvous. SETI searches for aliens through habits we imagine they share.
At Earth’s transit midpoint, the Allen Telescope Array, a radio observatory, watches the anti-solar point for a narrowband signal drifting with Earth. The target comes from a neat idea: two civilizations might independently pick the same moment to speak. So SETI tests not just the sky, but our theory of how minds meet.
- What it could changeA signal there would turn a game-theory hunch into evidence that distant minds can coordinate around shared geometry.
- How it touches todayEvery targeted SETI search is also a choice about which human ideas of salience deserve telescope time.
- Our futureThe search could narrow the universe around assumptions only we made.
- The anti-solar strategy assumes that a distant observer in the transit zone would treat Earth’s transit midpoint as a meaningful communication opportunity.
- The survey does not assume extraterrestrial civilizations use the strategy; it defines a specific target that can be tested observationally.
- SETI skepticism distinguishes doubts about detecting signals on a given timescale from claims about whether extraterrestrial intelligence exists at all.
Sources · 8
- 3 Journals & institutions
- 1 Early research (not yet peer-reviewed)
- 1 Reference & archives
- 3 Other / unclassified
What do these mean?
- Journals & institutions. Published in a peer-reviewed journal, or from a university, government body, court or other institution.
- Early research (not yet peer-reviewed). A research paper posted publicly before independent experts have reviewed it (a preprint). Real researchers, but not yet checked.
- Reference & archives. Encyclopedias and web archives: a place to look something up or a stored copy, not an original source.
- Other / unclassified. A site we have not classified yet. This says nothing good or bad about it.
Featured · Primary source · arxiv.org
1. Introduction
Early research · not yet reviewed
1. Introduction A Technosignature Survey Of The Anti-Solar Point: The SETI Institute’s Largest-Ever Campaign With The Allen Telescope Array Isabel A. Gerrard a,b, Sofia Z. Sheikh b,c a Breakthrough Listen, University of Oxford, Department of Physics, Oxford, UK, OX1 3RH b The SETI Institute, Mountai
Read sourceAnalysis · astrocurrent.com
SETI Survey Uses Game Theory to Target the Anti-Solar Point
Other
SETI Survey Uses Game Theory to Target the Anti-Solar Point # SETI Survey Uses Game Theory to Target the Anti-Solar Point By AstroCurrent Editorial Team / 4 November 2026 An Allen Telescope Array radio dish at sunset during the anti-solar point SETI campaign. (Photo: Isabel Gerrard, edited by Ananya
Read sourceAnalysis · doi.org
A Large-Scale Survey of the Anti-Solar Point with the Allen Telescope Array
Journal · peer-reviewed
# A Large-Scale Survey of the Anti-Solar Point with the Allen Telescope Array Zenodo (CERN European Organization for Nuclear Research). Published: 2026-01-04. 0 citations. ## Abstract In the search for technosignatures, it can be useful to narrow down the cosmic haystack by prioritizing time-coordin
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