On the Line: The Story of the Greenwich Meridian
The Royal Observatory at Greenwich is the home of time and space, the Prime Meridian and Greenwich Mean Time (GMT). But have you ever stopped to ask what is the Prime Meridian and why it is at Greenwich? Why are all time zones across the world based on GMT? What is longitude and why is the meridian moving?
Written by Dr Louise Devoy, Senior Curator of the Royal Observatory at Royal Museums Greenwich.
- Provides clear explanations about latitude and longitude and the world’s time zones
- Offers a succinct history of the Meridian Line and its importance in defining international time standards
- Breaks down complex topics into manageable articles, with fun trivia to aid understanding
This insightful, concise guide reveals why international time standards are based around the Greenwich meridian – Longitude 0º – where east meets west, and the important discoveries made at Greenwich that led to time as we know it.+ Read more - Show less
FREE UK Delivery for orders over £50
Our standard processing
and fulfillment time is 1-2 working days from the time you placed your order, excluding Custom Prints, online-only telescopes and personalised clothing.
All UK orders (excluding personalised clothing) are sent using a tracked service.
Custom Prints (those which are customised by choosing a size and frame) and personalised clothing take a little longer to fulfill due to being made to order.
Please see our Delivery & Returns page for more information and last order dates.
Online-only telescopes are shipped directly from Celestron.
FREE Standard UK delivery for all orders over £50 (Royal Mail)
For all other orders, we offer Standard UK delivery for £4.95 per order (Royal Mail).
We also offer UK FedEx 1-3 Working Days for £9.90. Excludes Custom Prints and Personalised Clothing.
International Delivery Information
Delivery rate varies by country and value of order, and starts from as little as £6.95.
Please allow 5-7 working days for standard orders to be dispatched.
Custom Prints (those which are customised by choosing a size and frame) and personalised clothing take a little longer to fulfill due to being made to order. Please see our recommended last order dates for these items on our Delivery & Returns page.
We send using a Royal Mail/FedEx tracked delivery service (excluding personalised products). Please allow 7-10 working days to receive after we have dispatched.
Please see our Delivery & Returns page for all information.
For all returns, please contact us as soon as possible using the contact form, expressing your wish to return. Please wait for confirmation from one of our team before returning.
Custom Prints (those which are customised by choosing a size and frame) and personalised clothing are made to order and therefore we are unable to offer a refund or exchange, unless they are faulty.
Please see our Delivery & Returns page for full information.
Every purchase supports the work of Royal Museums Greenwich
All proceeds from all purchases made on the Royal Museums Greenwich online shop support the work of the museum.
Should you wish to, you can now add a voluntary donation to your order. All donations, big or small, will make a difference.
Thank you for your continued support.