Spyros Volonakis

Naval Architect & Marine Engineer for occupation, amateur photographer for passion.

[Physics In History @PhysInHistory]

The most important equations in Physics and Mathematics 🧠

[Juanita Broaddrick @atensnut]

As a tribute to his grandmother, a Chinese artist and pyrotechnic expert created this stairway to Heaven. Stunning.

[Massimo @Rainmaker1973]

How to calculate the value of the sine, cosine, tangent and cotangent of the angle 0°, 30°, 45°, 60° and 90°.

The fingers are numbered sequentially numbers N={0, 1, 2, 3, 4}.

[🎞️ Minor]

[Massimo @Rainmaker1973]

Harrison Okene, the man who survived 60 hours in a capsized boat at the bottom of the sea.

In May 2013, Okene, a 29-year-old cook from Nigeria, was working on a tugboat. The boat was moving through stormy waters when a huge wave slammed into the vessel, causing it to capsize and sink 20 miles off the coast of Nigeria.

The boat came to a rest upside down on the sea bottom, at a depth of 30 m (98 ft).

Eleven crew members died, but in total darkness, Okene found himself trapped in an air pocket within the upturned vessel.

There, he fabricated a platform from a mattress and other materials which kept the upper part of his body above water that helped reduce heat loss.

This air pocket became his lifeline.

Three days after the accident, Okene was discovered by South African divers, Nicolaas van Heerden, Darryl Oosthuizen and Andre Erasmus, employed to investigate the scene and recover the bodies.

The rescuing divers fitted Okene with a diving helmet so he could breathe while being transferred into a closed diving bell and returned to the surface for decompression from saturation.

Okene lost consciousness during the transfer, but survived and he's today considered an accidental aquanaut.

[Wonder of Science @wonderofscience]

A surprising encounter for the EV Nautilus in the waters off Hawaii. Gulper eels can inflate their pouch-like mouths to eat much larger prey.

[Spyros Volonakis @SVolonak]

@florentiafl @kanenas_gr περί το 1cm/έτος χρειάζεται αντίστοιχα αναγωγή για την μεταβολή της ακτογραμμής.

[Spyros Volonakis @SVolonak]

@florentiafl @kanenas_gr Για την εξαγωγή των ορθών γωνιών (επικαιροποιημένες σύγχρονες τιμές) χρειάζεται αναγωγή λόγω μεταβολής του μαγνητικού βορρά συναρτήσει του χρόνου και της μεταβολής του μαγνητικού πεδίου στην περιοχή. Επίσης, λόγω της καταβύθισης της Πελοποννήσου στη συγκεκριμένη περιοχή με ρυθμό

[Spyros Volonakis @SVolonak]

@florentiafl @kanenas_gr Πρόκειται για καταφανή σημεία (οικίες) στη ξηρά που έχουν ληφθεί ως σημεία αναφοράς για τον προσδιορισμό της θέσης του πεδίου ενδιαφέροντος Οι μοίρες αντιστοιχούν στις διοπτεύσεις (γωνίες ως προς τον βορρά, από το σχήμα προκύπτει ότι η αναφορά γίνεται ως προς τον μαγνητικό βορρά)

[Prof. Feynman @ProfFeynman]

Equations that transformed our understanding of reality ✍️

[Massimo @Rainmaker1973]

The Olive tree of Vouveson on the island of Crete, Greece, is one of the oldest olive trees in the world.

Scientists from the University of Crete have estimated it to be 4,000 years old, which means that, when it sprouted, the last mammoths were still walking on Earth, someone in China was discovering bronze casting and the seventh Egyptian dinasty was declining.

The Minoan civilization was thriving and its monumental architecture was adorning the island of Crete. The first stones of the Palace of Minos at Knossos which inspired the myth of the Minotaur were laid.

This tree saw the humans deeds for thousands of years, from the Bronze Age to the artificial intelligence and, possibly the most amazing thing, it continues to produce olives at every season.

[Wonder of Science @wonderofscience]

Swimming with mobula rays making their annual migration near Baja California Sur.

📽: Aidan Bedford

[Massimo @Rainmaker1973]

In Spanish, but pretty intuitive animation explaining seasons, equinox, solstice, length of day and night

https://t.co/fwAkSz6RE7

[Wonder of Science @wonderofscience]

The rolling sand dunes of Mars.

📸: NASA/JPL-Caltech/MSSS
https://t.co/XaLA0LDR9E

[Tansu Yegen @TansuYegen]

Wow! Cars getting faster!🚗💨

[Massimo @Rainmaker1973]

How much of this math do you know?

A clever animation vs math by Alan Becker

[full video: https://t.co/01sfmR3HFp]
https://t.co/coG89NqOtJ

[Massimo @Rainmaker1973]

A violin bow creates beautiful geometric figures from thin air. They are called Chladni figures

[📹 crystalsandsound]

[European Commission @EU_Commission]

The @CopernicusEU satellite systems are helping Greek authorities to assess the impact and extent of the wildfires.

Over 20 maps of the affected areas have been issued since the activation of the #EUCivilProtection Mechanism.

The maps show how the wildfires have spread ↓

[Copernicus EMS @CopernicusEMS]

🔴Update #EMSR686 #Greece🇬🇷

Our #RapidMappingTeam delivered its 6⃣th Monitoring Product for the historic #wildfire that continues to ravage the areas north of #Alexandroupolis

🔥A total burnt area of 8⃣0⃣8⃣,7⃣ km2 has been detected, an area larger than #NewYorkCity🇺🇸

[Wonder of Science @wonderofscience]

Astonishing footage of surfer Mason Hyce Barnes riding an enormous wave off Nazaré, Portugal.

[Nahel Belgherze @WxNB_]

It’s now official 🚨

Yesterday's average Sea Surface Temperature for the Mediterranean Sea reached 28.40°C, the highest in recorded history! This beats the previous record of 28.25ºC set during the European heatwave of August 2003.