Out of the three sacredly worshipped Shivlingas of universe God Mahakaal of Ujjain has the greatest importance.
आकाशे तारकांलिंगम्, पाताले हाटकेश्वरम्।
मृत्युलोके महाकालं, सर्वलिंग नमोस्तुते।।
The Meaning is Tarakalinga is above the earth, haatkeshwarlinga beneath the earth and Mahakaal on the earth.
The greatness of Mahakaal is all pervasive. Mahakaal is the originator of the whole universal. Our everlasting faith in god and religion has major cause in believing Mahakaal as the Supreme god on the earth. Mahakaal himself is the propagator of the kaal (Time).
कालचक्र प्रवर्तको महाकाल: प्रतापन:।
VarahPuran gives the answer of the question of where situates Mahakaal on the earth, as Mahakaal resides on the center point (Nabhi) of the earth which is Ujjain.
Shree Mahakaleshwar is honour for Ujjain, the glory of Mahakaal is Divining. As per ShivPuran Mahakal is famous among 12 Jyotriling because he himself is Kaal of Kaal.
सौराष्ट्रे सोमनाथं च श्री शैले मल्लिकार्जुनम्।
परल्यां बैजनाथं च डाकिन्यां भीमशंकरम्।
सेतुबन्धे तु रामेशं नागेशं दारूकावने।।
वाराणास्यां तु विश्वेशं त्रंयबकं गौमती तटे।
हिमालये तु केदारं घुश्मेशं च शिवालये।।
एतानि ज्योतिर्लिंगानि सायं प्रात: पठेन्नर:।
सप्त जन्म कृतं पापं स्मरणेन विनश्यति।।
These 12 jyotirlings are situated in all directions of India as Kedarnath is in North, Rameshwaram is in South, Somanath is in West, Mallikarjun in East and Mahakaal is Situates in the center of India. The rest Jyotirlings are also situated in important directions with specific angles.
Mahakaal and Astrology
Jyotirlings is not only a symbol of knowledge and light but also of astrological calculations. The center of this calculation is Mahakaal. There are 12 Jyotirlings, 12 Sun(Aditya), 12 months, 12 planets and 12th hours in kundali and all these are 12th hours of the kundali of India. Therefore these are sacred and worshiped for time immemorial and these 12 give equal results as those of the 12 hours of kundali.
The resolution of the problems associated with the agents of the 12 kundali hours can be obtained by worshiping jyotirlings placed in 12 different places. The line of cancer (Kark) passes from Ujjain and in the form of whose center the temple of Karkrayeshwar is situated in Ujjain.
The World famous Mahakaleshwar Temple is 2 Km away from the Ujjain Railway station and is spread over a large area on the banks of river Kshipra. This is the only Jyotirling that has south facing. In the Garbhgriha of the Temple there are silver statues of Shri Ganesha, Shri Kartkeya and Parvati. On the inner wall of roof there is a Rudra Yantra which made up of 100 Kg Silver and just under this situates the Jyotirling. The statue of Nandi is at the front of the Garbhgriha gate. The bhasmarti takes place everyday at 4 am only in this temple. On every Monday during the Shravan, Mahakaleshwar the ruler of Ujjain takes a round of the city. The present Temple was built in the Maratha time but the nearly pond was built during the Parmar Time.
History of the Temple
Avanti Khand of the Skand Puran says that
महाकाल: सरिच्छिप्रा गतिश्चैव सुनिर्मला,
उज्जयिन्यां विशालाक्षीं वास: कस्य न रोचते।।
स्नानं कृत्वा नरो यस्तु महानद्यां हि दुर्लभम।
महाकालं नमस्कृतं नरो मृत्यं न शोचयेत्।।
Means who will not like the place where there is Mahakaleshwar, there is clean water of Kshipra. One does not fear from death on having Mahakaal Darshan after taking bath in Shipra.