Volvelle Philippe Development (an eclipse astronomical instrument).
The Philippe Volvelle Development is an astronomical instrument that was created by Philippe De La Hire in the Middle Ages. Philippe is a French scientist who has universal knowledge. This is evidenced by his works. In total there were 545 works by Philippe De La Hire during his lifetime. In astronomy, there are 103 works. Meanwhile, in other fields, there are 263 works of geometry, 46 architectures, 28 religions, 68 literatures and 39 other fields.
Unfortunately his instrument had expired in 1584 AD. This is what finally made me move to research and try to develop it. Luckily, I managed to develop and revive the active period of this instrument so that it can be used again until the year 2195 AD.
This work is the only eclipse prediction instrument in our country (Indonesia) and is specially designed to be able to determine the time of eclipse, both solar and lunar eclipses in a very easy and fast way.
This Volvelle can be used to predict eclipses until 2195 AD.
PHILIPPE VOLVELLE DEVELOPMENT COMPONENT
There are four components that are interconnected so that this tool can be used to determine the eclipse time, namely :
1. Calendar Plate (located at the base of instrument and contains information about the date and month).
2. Division Plate (located above the calendar plate and contains month lunation numbers).
3. Epoch Plate (located above the division plate and contains year data used to help predict eclipses).
4. Alidade / ruler (top and has a function to transfer data from epoch plate to calendar plate).
Four components of Volvelle Philippe Development
HOW TO USE?
Overall, users only need two rotations to be able to find out eclipse events in one calendar year. However, users can follow steps below.
1. Find the year you want to predict on the epoch plate
Here we will get data including Lun (month lunation number), Sol (Year), Mois (Month), J (date), H (hour), and M (minute).
Download Volvelle Philippe Development Epoch
2. Align the tab of the epoch plate to lun number (Lun number) on the division plate.
2. AD 2039. The year of the month falls on the number 12 and corresponds to February 23. Set it up as steps 2 and 3 in the HOW TO USE chapter. As for the fact that it falls in February, we have to move the two plates (division and epoch plate) together back 18 days (cz 2039 is common year). Next, we'll see the plates shift toward February 5 and generate data for the eclipse on June 6 (partial lunar eclipse) and the annular solar eclipse on June 21.
2. Align the tab of the epoch plate to lun number (Lun number) on the division plate.
This is the first rotation.
3. Move the two plates that are straight above together to the date, hour, minute and month on the calendar plate.
3. Move the two plates that are straight above together to the date, hour, minute and month on the calendar plate.
This is the second rotation and the instrument can already track the eclipse.
4. Look at the small hole circle on the epoch plate.
4. Look at the small hole circle on the epoch plate.
If you see a red color, then it’s an indication of a lunar eclipse and if it is black, it’s an indication of a solar eclipse.
5. Use ruler to see the date, time and month of the eclipse.
5. Use ruler to see the date, time and month of the eclipse.
The trick is to point the ruler to the center point of the small colored circle.
IS THIS ONLY FOR PARTICULAR LOCATIONS?
This volvelle can be used wherever you are. Because it is not associated with a specific location. The clock results obtained are the UT version. So you can adjust it to the longitude of each location.
ADDITIONAL INFORMATION
1. If the date of the new moon falls in November, December, January and February, this may require a simultaneous backward motion between the division plate and epoch by 18 days (if it occurs in common year) and 19 days (if in leap year). This step is so that we can see the potential for an eclipse from March 1st.
2. If you want to see an eclipse in the year before the given data, then set the Volvelle using the previous year's data.
VOLVELLE CALCULATION EXAMPLE
1. AD 2023. The year of the moon falls at 175 which coincides with August 16. Set the Volvelle as steps 2 and 3 in the HOW TO USE chapter. Finally, it is known that there will be an annular solar eclipse on October 14 and a partial lunar eclipse on October 28.
IS THIS ONLY FOR PARTICULAR LOCATIONS?
This volvelle can be used wherever you are. Because it is not associated with a specific location. The clock results obtained are the UT version. So you can adjust it to the longitude of each location.
ADDITIONAL INFORMATION
1. If the date of the new moon falls in November, December, January and February, this may require a simultaneous backward motion between the division plate and epoch by 18 days (if it occurs in common year) and 19 days (if in leap year). This step is so that we can see the potential for an eclipse from March 1st.
2. If you want to see an eclipse in the year before the given data, then set the Volvelle using the previous year's data.
VOLVELLE CALCULATION EXAMPLE
1. AD 2023. The year of the moon falls at 175 which coincides with August 16. Set the Volvelle as steps 2 and 3 in the HOW TO USE chapter. Finally, it is known that there will be an annular solar eclipse on October 14 and a partial lunar eclipse on October 28.
- Step 1 (Find the year you want to predict on the epoch plate)
- Step 2 (Align the tab of the epoch plate to lun number (Lun number) on the division plate)
- Step 3 (Move the two plates that are straight above together to the date, hour, minute and month on the calendar plate)
- Step 4 (Look at the small hole circle on the epoch plate)
- Step 5 (Use ruler to see the date, time and month of the eclipse)
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| Solar Eclipse 14 October |
- Next
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| Partial Lunar Eclipse on 28 October. |
2. AD 2039. The year of the month falls on the number 12 and corresponds to February 23. Set it up as steps 2 and 3 in the HOW TO USE chapter. As for the fact that it falls in February, we have to move the two plates (division and epoch plate) together back 18 days (cz 2039 is common year). Next, we'll see the plates shift toward February 5 and generate data for the eclipse on June 6 (partial lunar eclipse) and the annular solar eclipse on June 21.
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