About Acadia Tides

Disclaimer

Although Acadia Tides was coded with care, it may contain errors yielding wrong results. There is no guarantee for the correctness of these results. Do not rely on the output of this program for decisions that can result in harm to anyone or anything. Agencies like NOAA and the United States Naval Observatory exist because there is a need for certifiably correct tide, sun, and moon predictions. Please do not rely on Acadia Tides if you need guaranteed results.

Embedding Acadia Tides

To embed this web app into another web page, simply copy and paste one of the following lines of code.

For Bar Harbor tides:
<iframe width="300" height="456" src="http://dotding.com/tides/assets/bh_iframe.htm" style="border:none;"></iframe>

For Winter Harbor tides:
<iframe width="300" height="456" src="http://dotding.com/tides/assets/wh_iframe.htm" style="border:none;"></iframe>

Below is a small screenshot of what the embedded code renders. (Click or tap for larger image.)

Calculations

Tides

The tide predictions displayed on this site are pulled from downloaded XML data calculated and provided by NOAA. Bar Harbor and Winter Harbor data are available from NOAA's Tides & Currents website.

Sunrise & Sunset

Sunrise and sunset predictions are calculated using PHP's date_sunrise and date_sunset functions. These functions can return predictions that may vary from United States Naval Observatory predictions by a couple of minutes.

Variables used in the calculation are based on a location of Bar Harbor, Maine:

• Latitude: 44° 23'
• Longitude: -68° 13'
• Offset (from GMT): -4 or -5 (depending on whether daylight saving time is in effect)
• Zenith: 90° 50'

Fraction of the Moon Illuminated

The fraction of the Moon illuminated is pulled from United States Naval Observatory data that has been downloaded and converted to CSV files. The percentage of Moon illuminated for each day is calculated based on a reference time of noon.

Time

All times are local to Acadia National Park, Maine, USA.

Acadia National Park

Learn more about Acadia National Park and plan your visit on the NPS.gov website.

Contact

Visit dotding.com send us a message via the form below.

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