![Greenwich's incredibly cool 'Meridian laser beam', what it's for and why residents on the other side of London complained - MyLondon Greenwich's incredibly cool 'Meridian laser beam', what it's for and why residents on the other side of London complained - MyLondon](https://i2-prod.mylondon.news/incoming/article25995558.ece/ALTERNATES/s615/0_GettyImages-184987993-1.jpg)
Greenwich's incredibly cool 'Meridian laser beam', what it's for and why residents on the other side of London complained - MyLondon
![A green laser beam marking the Greenwich Meridian Line shines at night in front of the Canary Wharf skyscraprs in London Stock Photo - Alamy A green laser beam marking the Greenwich Meridian Line shines at night in front of the Canary Wharf skyscraprs in London Stock Photo - Alamy](https://c8.alamy.com/comp/AR0KYN/a-green-laser-beam-marking-the-greenwich-meridian-line-shines-at-night-AR0KYN.jpg)
A green laser beam marking the Greenwich Meridian Line shines at night in front of the Canary Wharf skyscraprs in London Stock Photo - Alamy
![Every night, a green laser at the Royal Observatory marks the Greenwich Meridian onto the night sky : r/london Every night, a green laser at the Royal Observatory marks the Greenwich Meridian onto the night sky : r/london](https://preview.redd.it/every-night-a-green-laser-at-the-royal-observatory-marks-v0-2fugqi6jmafa1.jpg?auto=webp&s=3c3d998d5f582ed0c791241bb5b30f498882d131)
Every night, a green laser at the Royal Observatory marks the Greenwich Meridian onto the night sky : r/london
![Meridian line laser and Flamsteed House, Royal Observatory from the grounds of Royal Museums Greenwich, 2005 (photo) by Meridian line laser and Flamsteed House, Royal Observatory from the grounds of Royal Museums Greenwich, 2005 (photo) by](https://images-cdn.bridgemanimages.com/api/1.0/image/600wm.XXX.18324370.7055475/7339202.jpg)
Meridian line laser and Flamsteed House, Royal Observatory from the grounds of Royal Museums Greenwich, 2005 (photo) by
![Greenwich Meridian Line: After 131 years it turns out the Line is in the WRONG place - Mirror Online Greenwich Meridian Line: After 131 years it turns out the Line is in the WRONG place - Mirror Online](https://i2-prod.mirror.co.uk/incoming/article6248051.ece/ALTERNATES/s1200b/PAY-Greenwich-Meridian-Line.jpg)
Greenwich Meridian Line: After 131 years it turns out the Line is in the WRONG place - Mirror Online
![The O2 on Twitter: "Great pic“@MPSinthesky:@TheO2 with Greenwich Meridian identified by laser from Greenwich Observatory @ROGAstronomers http://t.co/udgv0WwN5v”" / Twitter The O2 on Twitter: "Great pic“@MPSinthesky:@TheO2 with Greenwich Meridian identified by laser from Greenwich Observatory @ROGAstronomers http://t.co/udgv0WwN5v”" / Twitter](https://pbs.twimg.com/media/Bch0AGMIAAAqt12.jpg)
The O2 on Twitter: "Great pic“@MPSinthesky:@TheO2 with Greenwich Meridian identified by laser from Greenwich Observatory @ROGAstronomers http://t.co/udgv0WwN5v”" / Twitter
![Londoners convinced 'aliens are landing' as 'crazy beam' from green laser lights up East London sky - MyLondon Londoners convinced 'aliens are landing' as 'crazy beam' from green laser lights up East London sky - MyLondon](https://i2-prod.mylondon.news/incoming/article25785750.ece/ALTERNATES/s1200c/0_GettyImages-566431247.jpg)
Londoners convinced 'aliens are landing' as 'crazy beam' from green laser lights up East London sky - MyLondon
![What The F*** Facts on Twitter: "A laser shoots across London from Greenwich, signifying the meridian line at 0 degrees longitude. http://t.co/9YyCQPF507" / Twitter What The F*** Facts on Twitter: "A laser shoots across London from Greenwich, signifying the meridian line at 0 degrees longitude. http://t.co/9YyCQPF507" / Twitter](https://pbs.twimg.com/media/Bq38sp4IMAAh2di.jpg)