{"id":18757,"date":"2017-04-07T22:22:23","date_gmt":"2017-04-07T16:52:23","guid":{"rendered":"http:\/\/astron-soc.in\/outreach\/?page_id=18757"},"modified":"2023-05-02T14:13:19","modified_gmt":"2023-05-02T08:43:19","slug":"zero-shadow-day","status":"publish","type":"page","link":"https:\/\/astron-soc.in\/outreach\/activities\/zero-shadow-day\/","title":{"rendered":"Zero Shadow Day"},"content":{"rendered":"
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Zero Shadow day<\/h1>\n\t\t
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\u201cI thought the most beautiful thing in the world must be shadow.\u201d - Sylvia Plath, The Bell Jar<\/h3>\n\t\t<\/div><\/div><\/div>
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\"\"<\/p>\n

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The lack of shadow is beautiful too. And it happens twice a year, for places between +23.5 and -23.5 degrees latitude. The Sun is almost never exactly overhead at noon, but usually transits a bit lower in altitude, a bit to the north or a bit to the south. We have all studied in school that the Earth's rotation axis is inclined at 23.5 degrees to the plane of its revolution around the Sun, which is why we have seasons. This also means that the Sun, in its highest point of the day, will move from 23.5 degrees south of the celestial equator to 23.5 degrees north of the equator (Uttarayan), and back again (Dakshinayan), in a year. Of course, the northern most and southern most points are the two solstices, and the crossing of the Sun across the equator are the two equinoxes.<\/p>\n

For people living between +23.5 and -23.5 degrees latitude, the Sun's declination<\/a> will be equal to their latitude twice - once during Uttarayan and once during Dakshinayan. On these two days, the Sun will be exactly overhead at noon and will not cast a shadow of an object on the ground. This Zero Shadow Day<\/b> will clearly be different for different places on earth.<\/p>\n

Scroll down below to find your local ZSD<\/a>, state-wise maps<\/a>, resource material<\/a>, and public ZSD events<\/a>.<\/p>\n

 <\/p>\n<\/div>\n<\/div><\/div><\/div><\/div>

An Android App<\/h3>\t\t\t

You can now download an android app<\/a> for your phone that was created for our Zero Shadow Day campaign.<\/p>\n

The app will tell you the ZSD and local noon for your location or any other place, lets you interactively explore the length of shadows and the position of the Sun for any date, time and place, and also have animations that will help you understand and teach others about the ZSD. The app is coming soon in Tamil, Malayalam, Kannada, Telugu, Marathi and Hindi!<\/p>\n

This app was made for ASI POEC by Alok Mandavgane.<\/a><\/p>\n<\/div>\n\t\t<\/div><\/div>

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<\/p>\n<\/div>\n\t\t<\/div><\/div><\/div><\/div>

When is Zero Shadow Day at your location?<\/h3>\t\t\t
You can find the two Zero Shadow Days at your location using this interactive map<\/a> made by Alok Mandavgane.\n\n<\/div>\n\t\t<\/div>

Scroll down to find the nearest place to your location<\/h3>\t\t\t
\n \n \n \n\n \n \n
ZSD<\/th>\n Places<\/th>\n <\/tr>\n <\/thead>\n
6 Apr & 5 Sep<\/td> Indira Point<\/td><\/tr>\n
10 Apr & 1 Sep<\/td> Kanyakumari, Nagercoil, Kudankulam, Trinket Island<\/td><\/tr>\n
11 Apr & 31 Aug<\/td> Kovalam, Trivandrum, Kazhakoottam, Nedumangadu, Sathankulam, Tiruchendur<\/td><\/tr>\n
12 Apr & 30 Aug<\/td> Varkala, Ponmudai, Paravur, Kollam, Kottarakara, Punalur, Tenkasi, Tirunelveli, Thoothukudi, <\/td><\/tr>\n
13 Apr & 29 Aug<\/td> Kayankulam, Adoor, Thiruvalla, SankaranKoil, Kovilpatti, Rameshwaram, Ramanathapuram, Car Nicobar<\/td><\/tr>\n
14 Apr & 28 Aug<\/td> Alappuzha, Kottayam, Vaikom, Pala, Sabarimala, Cumbum, Rajapalayam, Sivakasi, Virudhunagar, Paramakudi<\/td><\/tr>\n
15 Apr & 27 Aug<\/td> Kochi, Vypin, Thodupuzha, Idukki, Munnar, Theni, Andipatti, Tirumangalam, Madurai, Sivaganga, Karaikudi<\/td><\/tr>\n
16 Apr & 26 Aug<\/td> Paravur, Aluvag, Chalakudy, Valparai, Kodaikanal, Dindigul, Pudukottai, Pattukottai, Vedaranyam<\/td><\/tr>\n
17 Apr & 25 Aug<\/td> Guruvayur, Ponnani, Thrissur, Ottapalam, Palakkad, Pollachi, Mettupalayam, Udumalpet, Palani, Trichy, Thanjavur, Thiruvarur, Nagapattinam, Little Andaman<\/td><\/tr>\n
18 Apr & 24 Aug<\/td> Kottakal, Malappuram, Coimbatore, Gudalur, Palladam, Tiruppur, Kangayam, Karur, Kumbakonam, Mayiladuthurai, Karaikal, Poompuhar<\/td><\/tr>\n
19 Apr & 23 Aug<\/td> Kozhikode, Koyilandy, Thamarassery, Ooty, Kotagiri, Avinashi, Erode, Tiruchengode, Namakkal, Sirkazhi, Chidambaram<\/td><\/tr>\n
20 Apr & 22 Aug<\/td> Vadakara, Mahe, Thalassery, Perambra, Wayanad, Mudumalai, Bhavani, Mettur, Salem, Kallakuruchi, Neyveli, Panruti, Cuddalore, Port Blair<\/td><\/tr>\n
21 Apr & 21 Aug<\/td> Kannur, Payyanur, Taliparamba, Dharmapuri, Sankarapuram, Villupuram, Pondicherry, Havelock Island<\/td><\/tr>\n
22 Apr & 20 Aug<\/td> Kanhangad, Kasargod, Madikeri, Mysore, Srirangapatna, Shuivanasamudra, Chengam, Tiruvannamalai, Tindivanam, Long Island<\/td><\/tr>\n
23 Apr & 19 Aug<\/td> Uppala Gate, Puttur, Arakalagud, Krishnarajapete, Melkote, Mandya, Channapatna, Ramanagara, Attibele, Hosur, Krishnagiri, Tirupattur, Vanaiyambadi, Kavalur, Ambur, Arani, Kanchipuram, Chengalpattu, Mahabalipuram, Kelambakkam<\/td><\/tr>\n
24 Apr & 18 Aug<\/td> Mangalore, Mooadbidri, Bantwal, Sakleshpur, Hassan, Shravanabelagola, Bidadi, Bangaluru, Dasarahalli, Bangarapet, Kolar, Gudiyattam, Vellore, Arcot, Arakkonam, Sriperumbudur, Tiruvallur, Avadi, Chennai, Interview Island, Sound Island<\/td><\/tr>\n
25 Apr & 17 Aug<\/td> Udupi, Brahmavar, Karkala, Sringeri, Kudremukha, Chickmagaluru, Halebeedu, Arsikere, Tiptur, Tumkur, Doddaballapura, Chickballapura, Chintamani, Chittoor, Thiruthani, Minjur, Pulicat, North Andaman<\/td><\/tr>\n
26 Apr & 16 Aug<\/td> Kundapura, Trasi, Thirthahalli, Kuppali, Kadur, Tarikere, Sira, Gauribidanur, Peddur, Madanapalle, Tirupati, Srikalahasti, Sriharikota<\/td><\/tr>\n
27 Apr & 15 Aug<\/td> Bhatkal, Muthala, Shivamogga, Channagiri, Hiriyur, Madakasira, Rayachoty<\/td><\/tr>\n
28 Apr & 14 Aug<\/td> Honnavar, Kumta, Jog Falls, Shikaripur, Challakere, Kadiri, Nellore<\/td><\/tr>\n
29 Apr & 13 Aug<\/td> Kumta, Gokarna Sirsi, Ranebennur, Davangere, Anantapur, Cuddapah, Ramathirtham<\/td><\/tr>\n
30 Apr & 12 Aug<\/td> Karwar, AgondBa, Haveri, Kudigi, Tadipatri. Jammalamadugu, Proddatur, Kavali<\/td><\/tr>\n
1 May & 11 Aug<\/td> Benaulim, Margao, Dandeli, Hubli, Hospet, Bellary, Guntakal, Gooty<\/td><\/tr>\n
2 May & 10 Aug<\/td> Panjim. Vasco, Anjuna, Dharwad, Gadag, Gangavathi, Nandyal, Ongole<\/td><\/tr>\n
3 May & 9 Aug<\/td> Sawantwadi, Belgaum, Sindhanur, Kurnool, Markapur, Chirala, Bapatla<\/td><\/tr>\n
4 May & 8 Aug<\/td> Malvan, Gokak, Bagalkot, Vinukonda, Chilakaluripet, Machilipatnam<\/td><\/tr>\n
5 May & 7 Aug<\/td> Devgad, Radhanagari, Mudhol, Raichur, Deosugur, Narasaraopet, Guntur, Mangalagiri, Gudivada<\/td><\/tr>\n
6 May & 6 Aug<\/td> Ambolgad, Kolhapur, Ichalkaranji, Yadgir, Mahbubnagar, Vijayawada, Eluru, Bhimavaram, Tanuku<\/td><\/tr>\n
7 May & 5 Aug<\/td> Ratnagiri, Sangli, Miraj, Vijayapura, Nalgonda, Nuzividu, Tadepalligudam, Rajahmundry, Kakinada<\/td><\/tr>\n
8 May & 4 Aug<\/td> Jaigad, Karad, Afzalpur, Kalburgi, Suryapet, Khammam, Samarlakota<\/td><\/tr>\n
9 May & 3 Aug<\/td> Chiplun, Mandrup, Akkalkot, Hyderabad, Secunderabad, Kothagudam<\/td><\/tr>\n
10 May & 2 Aug<\/td> Satara, Pandharpur, Solapur, Basavakalyan, Sangareddy, Jangaon, Palwancha, Visakhapatnam<\/td><\/tr>\n
11 May & 1 Aug<\/td> Mahabaleshwar, Phaltan, Tuljapur, Medak, Warangal, Vizianagaram<\/td><\/tr>\n
12 May & 31 Jul<\/td> Mangaon, Baramati, Barshi, Osmanabad, Ausa, Nariapur, Malkangiri, Srikakulam<\/td><\/tr>\n
13 May & 30 Jul<\/td> Mulshi, Pune, Daund, Latur, Karimnagar, Pamunuru, Sukma, Salur, Bobili<\/td><\/tr>\n
14 May & 29 Jul<\/td> Alibaug, Lonavla, Talegaon Dabhade, Pimpri Chichwad, Dehu Road, Jamkhed, Ambajogai, Nizamabad, Korutla, Ramagundam, Palakonda<\/td><\/tr>\n
15 May & 28 Jul<\/td> Mumbai, Navi Mumbai, Karjat, Matheran, Rajgurunagar, Manchar, Ralegan-Siddhi, Beed, Gangakhed, Mancherial, Mandamarri, Dantewada, Jagdalpur, Jeypore<\/td><\/tr>\n
16 May & 27 Jul<\/td> Borivali, Thane, Dombivili, Kalyan, Bhiwandi, Badlapur, Narayangaon, Khodad, Ahmednagar, Parbhani, Nanded, Nirmal, Mamda, Dudme, Bastar, Nowrangpur, Rayagada, Taptapani, Brahmapur<\/td><\/tr>\n
17 May & 26 Jul<\/td> Nala Sopara, Virar, Asangaon, Basmat, Kouta, Aheri, Chhota Dongar, Mahulpatna, Pattapur, Ganjam<\/td><\/tr>\n
18 May & 25 Jul<\/td> Palghar, Kasara Budruk, Sangamner, Shrirampur, Ambad, Hingoli, Adilabad, Mulchera, Koksara, Satapada<\/td><\/tr>\n
19 May & 24 Jul<\/td> Dahanu, Nashik, Kopargaon, Vaijapur, Aurangabad, Jalna, Pusad, Balharshah, Rowghat, Dharmagarh, Bhawanipatna, Bellaguntha, Puri<\/td><\/tr>\n
20 May & 23 Jul<\/td> Talasari, Takh, Mehkar, Washim, Wani, Chandrapur, Mul, Keskal, Nayagarh, Motari, Saharabedi<\/td><\/tr>\n
21 May & 22 Jul<\/td> Bilad, Silvassa, Khedgaon, Manmad, Kannad, Chikhli, Rohna, Wadki, Bhanupratappur, Kanker, Kusuruparaha, Bhubaneswar, Paradeep<\/td><\/tr>\n
22 May & 21 Jul<\/td> Daman, Vapi, Malegaon, Chalisgaon, Buldana, Khopadi, Yavatmal, Armori, Charama, Saintala, Phulbani, Cuttack<\/td><\/tr>\n
23 May & 20 Jul<\/td> Diu, Valsad, Bhadgaon, Khamgaon, Akola, Wardha, Kusumkasa, Dhamtari, Balangir, Dhenkanal, Bharcchan<\/td><\/tr>\n
24 May & 19 Jul<\/td> Somnath, Jafarabad, Navsari, Amalsad, Dhule, Jamner, Shegaon, Nimbora, Wardha, Umred, Kurud, Nuapada, Angul, Bhuban, Jajpur<\/td><\/tr>\n
25 May & 18 Jul<\/td> Mangrol, Talala, Rajula, Mahuva, Vadoli, Sakri, Amalner, Jalgaon, Bhusawal, Telhara, Amravati, Rajnandgaon, Nawapara Nagar, Padmapur, Bhadrak<\/td><\/tr>\n
26 May & 17 Jul<\/td> Madhavpur, Datha, Surat, Bardoli, Vyara, Nardana, Chopda, Paratwada, Nagpur, Durg, Bhilai, Bhandara, DOngargarh, Raipur, Barpali, Markona<\/td><\/tr>\n
27 May & 16 Jul<\/td> Keshod, Savar Kundla, Alang, Nandurbar, Shirpur, Burhanpur, Tumsar, Gondia, Katapali, Chandipur<\/td><\/tr>\n
28 May & 15 Jul<\/td> Junagadh, Paltana, Ankleshwar, Shahada, Pandhurna, Tilda, Sambalpur, Balasore<\/td><\/tr>\n
29 May & 14 Jul<\/td> Porbandar, Upleta, Amreli, Bhavnagar, Bharuch, Sendhwa, Chichanda, Bhatapara, Jogal, Digha, Mousuni<\/td><\/tr>\n
30 May & 13 Jul<\/td> Ghumli, Jamkandorana, Rajpipla, Khargone, Khandwa, Betul, Balaghat, Raigarh, Jharsuguda, Banei, Contai, Pathar Pratima Island<\/td><\/tr>\n
31 May & 12 Jul<\/td> Bhogat, Bhanvad, Gondal, Gadhada, Amod, Nasvadi, Barwani, Birsa, Kawardha, Champa, Joda, Baripada, Nandigram<\/td><\/tr>\n
1 Jun & 11 Jul<\/td> Bhatiya, Kamlapur, Sarangpur, Dabhoi, Kasrawad, Sanawad, Chhindwara, Seoni, Mungeli, Bilaspur, Sundargarh, Barbil, Manda, Beida, Haldia, Devasora South<\/td><\/tr>\n
2 Jun & 10 Jul<\/td> Dwarka, Rajkot, Dholera, Vadodara, Bodeli, Manawar, Sukhtara, Pandaria, Rourkela, Baharagora, Tamluk, Phura<\/td><\/tr>\n
3 Jun & 9 Jul<\/td> Motikhavdi, Dhandhuka, Borsad, Harda, Chhapara, Korna, Banki Mongra, Lailunga, Jorapokhar, Kharagpur, Medinipur, Debra, Baruipur, South Bungtlang, Kawichaw East<\/td><\/tr>\n
4 Jun & 8 Jul<\/td> Jamnagar, Petlad, Tutugutu, Chaibasa, Kokpara, Jhargram, Bagnan, Maheshtala, Mothbari, Siaha<\/td><\/tr>\n
5 Jun & 7 Jul<\/td> Dhrol, Wankaner, Thrangadh, Limbdi, Anand, Mhow, Itarsi, Lakhnadon, Mandla, Pathalgaon, Ghatshila, Howrah, Kolkata, Hasnabad, Chawngte P, Vaumbuk<\/td><\/tr>\n
6-10 Jun & 6-2 Jul<\/td> Gandhidam, Morbi, Surendranagar, Dhrangadhra, Ahmedabad, Nadiad, Godhra, Dahod, Indore, Dewas, Hoshangabad, Narsingpur, Guthurma, Kunkuri, Jamshedpur, Dhaniakhali, Kalyani, Barrackpore, Bomgain, Basirhat, Lunglei, Lungsen<\/td><\/tr>\n
11-21 Jun & 2 Jul-21 Jun<\/td> Kothara, Bhuj, Gandhinagar, Ratlam, Ujjain, Tarana, Bhopal, Jabalpur, Shahpura, Chirimiri, Ambikapur, Surajpur, Ranchi, Balarampur, Purulia, Bankura, Burdwan, Hanshkali, Thenzawl, Serchhip, Zokhawthar<\/td><\/tr>\n
<\/td><\/tr>\n <\/tbody>\n<\/table>\n<\/div> \n\n
\nYou can also download this list as a pdf<\/a>.
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\n\nDownload the ZSD poster here as a pdf<\/a>.\n\n<\/a><\/div>\n\t\t<\/div><\/div>
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<\/a>

The apparent motion of the Sun in a year, leading to two equinoxes and solstices. \u00a9 R.L. McNish<\/p><\/div><\/div>\n\t\t<\/div><\/div><\/div><\/div>

Download state-wise maps with the ZSDs marked<\/h3>\t\t\t
These maps are from Alok Mandavgane<\/a>, with the dates overlaid on top.<\/div>\n\t\t<\/div><\/div><\/div><\/div>
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Kerala, T.N.,\n<\/a>\nPuducherry\n\n<\/a><\/div>\n\t\t<\/div><\/div>
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Karnataka\n<\/a>\n& Goa<\/div>\n\t\t<\/div><\/div>
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Telengana\n<\/a>\n& Andhra<\/div>\n\t\t<\/div><\/div>
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Maharashtra\n<\/a>\n<\/div>\n\t\t<\/div><\/div>
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Gujarat, \n<\/a>\nD&D, D&H\n<\/div>\n\t\t<\/div><\/div>
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M.P.\n<\/a>\n<\/div>\n\t\t<\/div><\/div>
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C'garh,\n<\/a>\nOdisha, W.B., Jharkhand<\/div>\n\t\t<\/div><\/div>
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Tripura &\n<\/a>\nMizoram<\/div>\n\t\t<\/div><\/div>
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Andaman &\n<\/a>\nNicobar<\/div>\n\t\t<\/div><\/div><\/div>

ZSD Posters<\/h3>\n\t\t