Just a line, nothing to see here😅. It inside the museum courtyard so you have to buy ticket if you want to take a photo of yourself standing above the Prime meridian line. The line continues outside the yard marked on the wall and the ground where is free to acces to anyone.

This is a great attraction to visit. I went here and was satisfied with my experience. The Prime Meridian separates the eastern and western hemispheres, so it’s a fascinating place to visit because you’re able to stand over it and be in two hemispheres at once. When I was here it wasn’t too busy. I gave this attraction five stars because it was interesting to see where the eastern and western hemispheres meet.

Here's the north-south line, selected as the 0 reference line for astronomical observation! It's quite interesting! In late 19th century, there are 72% of the world commerce depended on the sea-charts which used Greenwich as the Prime Meridian, so this is how it comes from.

Walked up the hill after visiting the Queen’s House (free admission). Decided not to go to the museum since we had already paid for the Royal Naval Museum at the bottom of the hill. Might come back to see the inside later on this trip. If you want to step on both sides of the prime meridian for free, go through the black iron gate to see the tail of the meridian. Great view of the surrounding area! There is a cafe and a shop as well as a planetarium.

If you're visiting London, I'd recommend making plans to visit the Greenwich Prime Meridian (as well as the Greenwich Market which is only a short walk away). And consider staying for at least a few hours. And if you're coming from the city, take either the tube or plan to take an Uber Boat via the Thames (which is what we did). And plan accordingly. The boats have a 'timetable,' but our boat was almost 25 minutes late from its posted departure time. But the ride was worth it and it was nice to get off the roads and out of the tube for a change. But back to the Prime Meridian. It's truly a marvel to stand at this precise point, on our precious blue marble, and understand exactly what this represents. If this is a place on your itinerary, the museum and other areas of interest and history are well worth the exploration. It's a lot to take in, so again, allow yourselves time to browse. Happy travels everyone!

Super day out visiting the Greenwich Meridian. There was a great view from the top, and it was a very interesting and informative attraction. Beware that it is quite a steep walk, so it may be tricky for some visitors with mobility issues. There was a good gift shop on site selling interesting and good quality gifts too.

Having visited the Equator, it was absolutely necessary that we also visit the Prime Meridian in Greenwich, England. :-) We noticed that many people seemed to go there without actually paying to enter the Royal Observatory, so they didn't get to 'stand astride' the line. Granted, there are signs that specifically say 'not to queue' on the line, yet there they were all lined up for a picture at one end of the grounds. I had to wonder if they realised that they had probably crossed the Meridian on their way to the Observatory. LOL.

A lot of history in such a small area, from the astronomical firsts that contributed so much to our knowledge of the Sun, Planets and the Universe, then all the way through to the establishment of the Prime Meridian at Greenwich, the Royal Observatory has a rich history, which is ably represented by the exhibits in the museum. The views from General James Wolfe's statue across the National Maritime Museum, Queen Anne's House and the Old Royal Naval College and the fabulous views of London, shouldn't be missed. PS Don't forget to set your watch by being there at 1.00pm.

Very kind people working at the museum, BUT book your tickets before you walk up the hill to the museum and check the opening times. If you don’t like to pay for the museum! - check the park opening times - right side next to the big gate is a small gate, which provides you access to the prime meridian line for free as well. Maybe not the same but still a low budget alternative.

I wanted to visit it for a very long time and finally I did it. I was not disappointed at all cos it is very interesting to see every part of the Royal Obsevatory. The prime meridian that can be found there is the line of 0° longitude, the starting point for measuring distance both east and west around Earth. Flamsteed house is also a very nice little museum and it is included in the entry price. In my opinion it is very interesting and well worth the visit.

Great location for some photos across Greenwich park and the river to the city. There is a short but steep section of footpath near the top by the Royal Observatory. Lots of trees in the park for shade on a sunny day.

Not very accessible to someone with an infant under 1. Lots to see but very very crowded, I would not suggest going to this place during busy times. Also, while the prime meridian and the science behind it is cool, choose to do something better with your time in London. It's not a great destination.

I have been waiting for many years to visit Prime Meridian & walk on the line & finally I made it. Beautiful beautiful beautiful experience. View from Prime Meridian is absolutely stunning. It was great to see the whole history & instruments in the museum.

If you are in London, make sure to find time and visit this place. Prime meridian holds both historic and scientific significance. It’s advisable to visit Prime meridian in the evening as the Laser is more clearer and you will get an amazing view of London City.

You have to pay to get inside the observatory and to see the meridian line. But if you walk just outside the building, there's a small black gate that gets you on a path where you can see some of the line and has a great view of the Greenwich harbor.

I expected it to be better. I stood on the prime meridian and checked the time because that's where time starts. There was interesting stuff in the inside. The octagon room had a telescope that goes to Saturn! It was incredible on the inside! I liked the experience.

We take all our family and friends visiting us to the Prime Meridian. About 15-20 minutes car ride from our home. Though we often go there when it's busy, and it's never been a problem purchasing the tickets on-site. So you don't necessarily need to buy the tickets in advance; they can easily be purchased over the counter at the museum.

A great museum made better by the friendly and well informed staff. We loved the thought that we were walking in the feet of so many famous astronomers.

Lovely place to cycle or walk to. Had a lovely view over London's skyline and even had a place to sit. Wasn't too busy even on the weekend which is rare for such a hidden jem!

Visiting the Greenwich Observatory Prime Meridian was an exceptional experience. The day blessed us with great weather, adding an extra touch of magic to an already captivating visit. The absence of crowds allowed for a serene exploration of this historical site, granting ample time to absorb the rich educational content it offers. The educational aspect was particularly engaging. The observatory’s exhibits and explanations about the history of time calculations and navigation were both enlightening and thought-provoking. Learning about the establishment of the prime meridian and its significance in global navigation was a highlight, making the visit not only enjoyable but also intellectually stimulating.

Excellent place to visit especially those who are interested in astronomy. Lovely view and a history lesson about those who established astronomy in England. Having a little photo opportunity with the prime meridian is a blast.

Beautiful place inside a large park. Located on a hill will beautiful views of London skyline. It’s a huge park with Greenery all around. Amazing Maritime museum is also there and it’s free with some interesting Maritime history. Good place to spend half a day with your family and friends. It ha s a pier as well and you can take city cruise to travel to west minister or Tower of London. It’s a amazing ride on the cruise especially during sunset.

Greenwich line, the place of time 00:00! It’s located in Greenwich park which is actually a very amazing park and it has a very special royal observatory of an amazing view! It is usually crowded though, but to a manageable point.

We walked up the hill fully expecting to go into the Greenwich Observatory, but the entrance price put us off. Instead, we went through the black wrought iron gate, and stood either side of the Prime Meridian there. Amazing views from the top of the hill.

It is the highest point in London so you must go, that it is out of the question. To visit and take the picture in the Prime Meridian is a must. But paying 18 pounds for entering the museum it is simple outrageous. It does not worth it.

A fun place to visit if knowing about time zones and origin of UTC is really your thing. It's located in Greenwich and a short walk from the tube station so we went with friends (without kids or pets) and it was pleasant enough. It can get very busy during weekends and when the weather is nice so I'd avoid peak hours. Do go inside the main building if you can and marvel at the time keeping paraphernalia and the history behind it. Buy tickets in advance online to save time on long queues!

It’s the famous meridian line which defines the east and west part of the world according to the time zone. I think to visit the meridian line was free of cost before but in my recent visit I experienced £18 entry fee. There is a museum inside included in this entry fee. Nothing hype, but visiting once is definitely recommended.

As a geography major, this was a remarkable experience. The point on earth where east meets west. The museum is flush with historical time pieces which were used on land and sea.

Went to the observatory with my niece & was very interesting & surprisingly the stuff in the gift shop wasn't ridiculously priced. Some of it was but others not. Was very interesting but not interactive enough for little ones.

Such a wonderful tourist spot. A Must experience longitude zero spot on Earth. A historic place. You can see large telescopes on display. You may buy a small booklet for 5 £ that would give the details of the spot.

A prime meridian for a planetary body not tidally locked (or at least not in synchronous rotation) is entirely arbitrary, unlike an equator, which is determined by the axis of rotation. However, for celestial objects that are tidally locked (more specifically, synchronous), their prime meridians are determined by the face always inward of the orbit (a planet facing its star, or a moon facing its planet), just as equators are determined by rotation. Longitudes for the Earth and Moon are measured from their prime meridian (at 0°) to 180° east and west. For all other Solar System bodies, longitude is measured from 0° (their prime meridian) to 360°. West longitudes are used if the rotation of the body is prograde (or 'direct', like Earth), meaning that its direction of rotation is the same as that of its orbit. East longitudes are used if the rotation is retrograde.

Super fun observatory and museum experience! Lots of history and unique artifacts to learn about how we developed the concept of time keeping and communications.

Recommended for a great view of London and its skyline. Check the time for sunset online and it will look even better. You don't need to pay the entry fee for this view since there is a small path to the right of the entrance gate. If it is too crowded you can also find good photo opportunities in the surrounding park.

Absolutely a fantastic walk in the park, with the Old Observatory and Mean time line. Definitely a must as its the highest point in London and the winds are fantastic

The best views of London in Greenwich park and an incredible collection of John Harrison's chronometers charting their evolution from clunky early prototype to elegant timepiece. One of the best museums in the world. And you can also straddle the prime meridian like millions of tourists before you.

The most spectacular view in southeast London. The Greenwich observatory is a wonderful museum for kids, adults, history buffs. Greenwich Park has enumerable walking trails filled with flowers and amazing trees

One of the best places to view the Thames from above. Good place to bring family/friends.

Must visit landmarks in London. Great views absolutely lived this place everytime visit. There is small coffee boots nearby so you won't get cold while sightseeing. Coffee boots closed at 18:00 and park close at 19:00.

I recommend visiting Greenwich Prime Meridian, The Royal Observatory. There is an excellent view over looking of London in addition.

Wanted to go since i was a child. But the meridian you see in the pictures is in thr courtyard of the Observatory and entrance ticket is 16£. And it closes at 16:15h. It is included in the London pass but the closing time is absurd. You do have a tiny meridian that you can access for free underneath the courtyard.

Nice place to go Not great to pay to get in but we saw the Line from the outside It's quite a walk up the hill so be prepared but it's lovely views

Great experience. Really nice park and a good visit

Greenwich mean time ( GMT / Prime Meridian), the place for time 00.00, located at Greenwich park. The park itself has stunning natural beauty. One of the most famous photo zone in london. Here there is a watch (Royal Observatory) which is unique in the world counting 24 hrs. A must visit place.

Had amazing sunset view from the mountain top, definitely check the open hours, the door close early though.

Prime Meridian has a fascinating history on its own, definitely worth being taken in consideration. The Greenwich Meridian is used to separate east from west in the same way that the Equator separates north from the south. In 1884 in Washington D.C. delegates gathered for an international convention to determine where the 0° of longitude should be. The majority of shipping companies at that time were already using British charts based on the British Meridian and it seemed agreeable for most of the nations represented to move towards a decision of adopting the same one as a Prime Meridian (longitude zero). The delegates recommended also the definition of a new global time zone system based on the Greenwich meridian. The alignments were checked with the help of two telescopes used together to determine the collimation (sight-line) of the Airy Transit Circle’s telescope and to ensure it is aligned correctly on the Meridian. In a separate building there is a huge telescope that defines the Prime Meridian even today. The telescope was commissioned by George Biddell Airy, seventh Astronomer Royal. History tells us that Astronomers worked in pairs on the Airy Transit Circle: one looked through the eyepiece while the other observed the microscope readings on the stone pier. The other two astronomers that worked on the meridian line were Edmond Halley and James Bradley. Halley’s Meridian line was defined by measuring the height of stars above the horizon; then their passage (or ‘transit’) was timed over the meridian mark by crosshairs in his telescope with an accurate pendulum clock. One of the most important observations was the Sun at solar noon. Bradley’s Meridian line was defined by the third Astronomer Royal who observed with improved accuracy while using the telescope. Time was measured by using distant stars ⭐️ in an attempt to be more accurate having in mind the unequal length of solar days. It is said that Astronomers’ clocks run slightly faster than normal clocks to show sidereal (star) time. Time has already began to play an important role with timekeeping and clocks being introduced in homes 🏡 and trades.

Make this a stop on your London visit. Informative and concise information. Lots to see and the view onto the city is spectacular. We pre-booked tickets for 1500 and walked straight in.

The history here and the views are unparalleled. It's worth the effort to get here and enjoy the observatory.

I stood with my right foot on the Eastern Hemisphere and with my left foot on the Western Hemisphere. This the only imaginary line which was drawn actually to explain the time theories. There are several clocks and their early mechanisms such as pendulum, spring, onshore, and offshore time keeping devices.