Lunar Calendar and Tide Calculator
This instrument consists of a lunar calendar on one side and an abacus or tide calculator on the other. It is based on the need to to predict the time of the passage of the Tides and the intimate relationship of these with the influence of the rotation of the Moon in its orbit around the Earth.
Knowing the phases of the moon is of great cultural importance for many peoples: calendars, religious festivals, agricultural practices, etc. The tide calculator or abacus is used to calculate tide times because of its important effects on navigation, ports and fishing.
In order to develop this instrument we analyzed several instruments of the XVI and XVII centuries (like those of the English School and H. Cole among others) such as astronomical compendiums, volvelles or abacuses in which they tried to determine a method to perform these calculations.
Maximum Height: 16,2cm / Diameter: 12cm / Thickness: 0,7cm
At this time, orders shipped within the United States are shipped using USPS or UPS. Tracking information will be provided via email.
International shipping is offered on case-by-case basis. Please email us at email@example.com to inquire.
For our local customers, we are pleased to offer a curbside pickup option! How it works:
Shop online at shop.pem.org
At checkout, select Curbside Pickup as your shipping method. Place your order.
Once we have prepared your order, you will receive an email that your order is ready for pickup.
Follow the pickup instructions provided in your email. Arrive at our designated curbside pickup location at 3 New Liberty Street and call 978-542-1619
- Orders not picked up within two weeks of order date will be canceled and refunded.
Please Note: Please allow 2-3 days from purchase date for processing. Curbside Pickup is available Thursday through Monday 11 am–4 pm.
RETURN & EXCHANGE POLICY
We are pleased to accept returns within 30 days of the purchase date. All returned items must be in their original condition and packaging.
To begin your return process, please email us at: firstname.lastname@example.org
Please note: Sale, clearance and personal use items, such as face masks, cannot be returned or exchanged for store credit.